The Early Christian Witness
There are two ways, one of life and one of death, and there is a great difference between these two ways.
Now this is the way of life: First, you shall love God, who made you. Second, you shall love your neighbor as yourself; but whatever you do not wish to happen to you, do not do to another. The teaching of these words is this: Bless those who curse you, and pray for your enemies, and fast for those who persecute you. For what credit is it if you love those who love you? Do not even the Gentiles do the same? But you must love those who hate you, and you will not have an enemy.…
The second commandment of the teaching is: You shall not murder; you shall not commit adultery; you shall not corrupt children; you shall not be sexually immoral; you shall not steal; you shall not practice magic; you shall not engage in sorcery; you shall not abort a child or commit infanticide.…You shall not hatch evil plots against your neighbor. You shall not hate anyone; instead you shall reprove some, and pray for some, and some you shall love more than your own life.
From the Didache (ca. AD 60–110) 1.1–4, 2.1–7, trans. Michael W. Holmes in Apostolic Fathers (Baker Academic, 2007).