Abortus
You shall not kill the child by obtaining an abortion. Nor, again, shall you destroy him after he is born. Barnabas (c. 70–130, E), 1.148.
You shall not murder a child by abortion nor kill one who has been born. Didache (c. 80–140, E), 1.377.
They bear children, but they do not destroy their offspring. Letter to Diognetus (c. 125–200), 1.27.
We say that those women who use drugs to bring on abortion commit murder. And we also say they will have to give an account to God for the abortion. So to the same person to regard the very fetus in the womb as a created being (and therefore an object of God’s care)—yet, when he has passed into life, to kill him. We also teach that it is wrong to expose an infant. For those who expose them are guilty of child murder. Athenagoras (c. 175, E), 2.147.
Fathers, forgetting about their children who have been exposed, often unknowingly have intercourse with a son that has debauched himself and with daughters who are prostitutes. Clement of Alexandria (c. 195, E), 2.276.
In our case, murder is once for all forbidden. Therefore, we may not destroy even the fetus in the womb, while as yet the human being derives blood from other parts of the body for its sustenance. To hinder a birth is merely a speedier way to kill a human. It does not matter whether you take away a life that has been born, or destroy one that is not yet born. Tertullian (c. 197, W), 3.25.
Indeed, the Law of Moses punishes with appropriate penalties the person who causes abortion. For there already exists the beginning stages of a human being. And even at this stage, [the fetus] is already acknowledged with having the condition of life and death, since he is already susceptible to both. Tertullian (c. 210, W), 3.218.
Are you to dissolve the conception by aid of drugs? I believe it is no more lawful to hurt a child in process of birth, than to hurt one who is already born. Tertullian (c. 212, W), 4.57.
There are some women who, by drinking medical preparations, extinguish the source of the future man in their very bowels. So they commit murder before they bring forth. And these things assuredly come down from the teaching of your gods. Mark Minucius Felix (c. 200, W), 4.192.