Matthew 7:12

Tertullian Scorpiace

And, "As ye would that men should do to you, do ye likewise so to, them."[65]

Cyprian Treatise IV On the Lord's Prayer

And again: "Whatsoever good things ye would that men should do unto you, do ye even so to them. For this is the law and the prophets."[79]

Archelaus Acts of the Disputation with the Heresiarch Manes

and know that it shall he mine if only I can be pure in heart? And that is quite in accordance with the truth which we have learned now, to wit, that if one prevails in the keeping of the two commandments, he fulfils the whole law and the prophets.[485]

Didache

and all things whatsoever thou wouldst should not occur to thee, thou also to another do not do.[6]

Clementine Homily XII

In one word, what he wishes for himself, he wishes also for his neighbour. For this is the law of God and of the prophets[15]

The Second Epistle of Pope Fabian

For there was no laying of accusations against each other among them, except what was friendly; neither ought there ever to be such among their followers or among believers: for the Lord says, "Do not that to another which thou wouldst not have done to thyself."[3]