Abortion

The Didache

"The second commandment of the teaching: You shall not murder. You shall not commit adultery. You shall not seduce boys. You shall not commit fornication. You shall not steal. You shall not practice magic. You shall not use potions. You shall not procure [an] abortion, nor destroy a newborn child" (Didache 2:1–2 [A.D. 70]).
The Letter of Barnabas

"The way of light, then, is as follows. If anyone desires to travel to the appointed place, he must be zealous in his works. The knowledge, therefore, which is given to us for the purpose of walking in this way, is the following. . . . Thou shalt not slay the child by procuring abortion; nor, again, shalt thou destroy it after it is born" (Letter of Barnabas 19 [A.D. 74]).
The Apocalypse of Peter

"And near that place I saw another strait place . . . and there sat women. . . . And over against them many children who were born to them out of due time sat crying. And there came forth from them rays of fire and smote the women in the eyes. And these were the accursed who conceived and caused abortion" (The Apocalypse of Peter 25 [A.D. 137]).
Athenagoras

"What man of sound mind, therefore, will affirm, while such is our character, that we are murderers? . . . [W]hen we say that those women who use drugs to bring on abortion commit murder, and will have to give an account to God for the abortion, on what principle should we commit murder? For it does not belong to the same person to regard the very fetus in the womb as a created being, and therefore an object of God’s care, and when it has passed into life, to kill it; and not to expose an infant, because those who expose them are chargeable with child-murder, and on the other hand, when it has been reared to destroy it" (A Plea for the Christians 35 [A.D. 177]).
Tertullian

"In our case, a murder being once for all forbidden, we may not destroy even the fetus in the womb, while as yet the human being derives blood from the other parts of the body for its sustenance. To hinder a birth is merely a speedier man-killing; nor does it matter whether you take away a life that is born, or destroy one that is coming to birth. That is a man which is going to be one; you have the fruit already in its seed" (Apology 9:8 [A.D. 197]).
"Among surgeons’ tools there is a certain instrument, which is formed with a nicely-adjusted flexible frame for opening the uterus first of all and keeping it open; it is further furnished with an annular blade, by means of which the limbs [of the child] within the womb are dissected with anxious but unfaltering care; its last appendage being a blunted or covered hook, wherewith the entire fetus is extracted by a violent delivery.
"There is also [another instrument in the shape of] a copper needle or spike, by which the actual death is managed in this furtive robbery of life: They give it, from its infanticide function, the name of embruosphaktes, [meaning] "the slayer of the infant," which of course was alive. . . .
"[The doctors who performed abortions] all knew well enough that a living being had been conceived, and [they] pitied this most luckless infant state, which had first to be put to death, to escape being tortured alive" (The Soul 25 [A.D. 210]).
"Now we allow that life begins with conception because we contend that the soul also begins from conception; life taking its commencement at the same moment and place that the soul does" (ibid., 27).
"The law of Moses, indeed, punishes with due penalties the man who shall cause abortion [Ex. 21:22–24]" (ibid., 37).
Minucius Felix

"There are some [pagan] women who, by drinking medical preparations, extinguish the source of the future man in their very bowels and thus commit a parricide before they bring forth. And these things assuredly come down from the teaching of your [false] gods. . . . To us [Christians] it is not lawful either to see or hear of homicide" (Octavius 30 [A.D. 226]).
Hippolytus

"Women who were reputed to be believers began to take drugs to render themselves sterile, and to bind themselves tightly so as to expel what was being conceived, since they would not, on account of relatives and excess wealth, want to have a child by a slave or by any insignificant person. See, then, into what great impiety that lawless one has proceeded, by teaching adultery and murder at the same time!" (Refutation of All Heresies [A.D. 228]).

Council of Elvira
"If a catechumen should conceive by an adulterer, and should procure the death of the child, she can be baptized only at the end of her life" (canon 68 [A.D. 305])..
Council of Ancyra

"Concerning women who commit fornication, and destroy that which they have conceived, or who are employed in making drugs for abortion, a former decree excluded them until the hour of death, and to this some have assented. Nevertheless, being desirous to use somewhat greater lenity, we have ordained that they fulfill ten years [of penance], according to the prescribed degrees" (canon 21 [A.D. 314]).
Augustine of Hippo (354-430)
"Sometimes, indeed, this lustful cruelty, or if you please, cruel lust, resorts to such extravagant methods as to use poisonous drugs to secure barrenness; or else, if unsuccessful in this, to destroy the conceived seed by some means previous to birth, preferring that its offspring should rather perish than receive vitality; or if it was advancing to life within the womb, should be slain before it was born" (De Nube et Concupiscentia 1.17 [15]).
"Hence in the first place arises a question about abortive conceptions, which have indeed been born in the mother's womb, but not so born that they could be born again. For if we shall decide that these are to rise again, we cannot object to any conclusion that may be drawn in regard to those which are fully formed. Now who is there that is not rather disposed to think that unformed abortions perish, like seeds that have never fructified? But who will dare to deny, though he may not dare to affirm, that at the resurrection every defect in the form shall be supplied, and that thus the perfection which time would have brought shall not be wanting, any more than the blemishes which time did bring shall be present: so that the nature shall neither want anything suitable and in harmony with it that length of days would have added, nor be debased by the presence of anything of an opposite kind that length of days has added; but that what is not yet complete shall be completed, just as what has been injured shall be renewed" (Enchiridion 23.85.4).
"And therefore the following question may be very carefully inquired into and discussed by learned men, though I do not know whether it is in man's power to resolve it: At what time the infant begins to live in the womb: whether life exists in a latent form before it manifests itself in the motions of the living being. To deny that the young who are cut out limb by limb from the womb, lest if they were left there dead the mother should die too, have never been alive, seems too audacious. Now, from the time that a man begins to live, from that time it is possible for him to die. And if he die, wheresoever death may overtake him, I cannot discover on what principle he can be denied an interest in the resurrection of the dead" (Enchiridion 23.86).
"Therefore brothers, you see how perverse they are and hastening wickedness, who are immature, they seek abortion of the conception before the birth; they are those who tell us, "I do not see that which you say must be believed" (Sermon 126, line 12)

Basil the Great

"Let her that procures abortion undergo ten years’ penance, whether the embryo were perfectly formed, or not" (First Canonical Letter, canon 2 [A.D. 374]).
"He that kills another with a sword, or hurls an axe at his own wife and kills her, is guilty of willful murder; not he who throws a stone at a dog, and unintentionally kills a man, or who corrects one with a rod, or scourge, in order to reform him, or who kills a man in his own defense, when he only designed to hurt him. But the man, or woman, is a murderer that gives a philtrum, if the man that takes it dies upon it; so are they who take medicines to procure abortion; and so are they who kill on the highway, and rapparees" (ibid., canon 8).
John Chrysostom

"Wherefore I beseech you, flee fornication. . . . Why sow where the ground makes it its care to destroy the fruit?—where there are many efforts at abortion?—where there is murder before the birth? For even the harlot you do not let continue a mere harlot, but make her a murderess also. You see how drunkenness leads to prostitution, prostitution to adultery, adultery to murder; or rather to a something even worse than murder. For I have no name to give it, since it does not take off the thing born, but prevents its being born. Why then do thou abuse the gift of God, and fight with his laws, and follow after what is a curse as if a blessing, and make the chamber of procreation a chamber for murder, and arm the woman that was given for childbearing unto slaughter? For with a view to drawing more money by being agreeable and an object of longing to her lovers, even this she is not backward to do, so heaping upon thy head a great pile of fire. For even if the daring deed be hers, yet the causing of it is thine" (Homilies on Romans 24 [A.D. 391]).
Jerome
"Others drink for sterility and commit murder on the human not yet sown. Some when they sense that they have conceived by sin, consider the poisons for abortion, and frequently die themselves along with it, and go to Hell guilty of three crimes: murdering themselves, committing adultery against Christ, and murder against their unborn child." (Epistle 22, [380 A.D.]).

The Apostolic Constitutions

"Thou shalt not use magic. Thou shalt not use witchcraft; for he says, ‘You shall not suffer a witch to live’ [Ex. 22:18]. Thou shall not slay thy child by causing abortion, nor kill that which is begotten. . . . [I]f it be slain, [it] shall be avenged, as being unjustly destroyed" (Apostolic Constitutions 7:3 [A.D. 400]).