Deuterocanon

Sirach 22:26

Ben Sira, Ecclesiasticus

26 But if harm should come to me because of him, whoever hears of it will beware of him. 27 Who will set a guard over my mouth, and an effective seal upon my lips, so that I may not fall because of them, and my tongue may not destroy me?

Date: 195-175 B.C.E.
* Dates are based on scholarly estimates

Ambrose On the Duty of the Clergy 3.22

129 If necessary, let us endure for a friend even hardship. Often enmity has to be borne for the sake of a friend's innocence; oftentimes revilings, if one defends and answers for a friend who is found fault with and accused. Do not be afraid of such displeasure, for the voice of the just says: Though evil come upon me, I will endure it for a friend's sake. In adversity, too, a friend is proved, for in prosperity all seem to be friends. But as in adversity patience and endurance are needed, so in prosperity strong influence is wanted to check and confute the arrogance of a friend who becomes overbearing.

Date: 390-395 C.E.
* Dates are based on scholarly estimates