"And the second commandment of the Teaching; 2. Thou shalt not commit murder, thou shalt not commit adultery, thou shalt not commit paederasty, thou shalt not commit fornication, thou shalt not steal, thou shalt not practise magic, thou shalt not practise witchcraft, thou shalt not murder a child by abortion nor kill that which is begotten."
Ante-Nicene Fathers: Volume VII, Apostolic Teachings and Constitutions, Chapter II. - The Second Commandment: Gross Sin Forbidden.