Sirach 22:25
Ben Sira, Ecclesiasticus25 I am not ashamed to shelter a friend, and I will not hide from him. 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?
Ambrose On the Duty of the Clergy 3.22
128 Open your breast to a friend that he may be faithful to you, and that you may receive from him the delight of your life. For a faithful friend is the medicine of life and the grace of immortality. Give way to a friend as to an equal, and be not ashamed to be beforehand with your friend in doing kindly duties. For friendship knows nothing of pride. So the wise man says: Do not blush to greet a friend. Do not desert a friend in time of need, nor forsake him nor fail him, for friendship is the support of life. Let us then bear our burdens as the Apostle has taught: for he spoke to those whom the charity of the same one body had embraced together. If friends in prosperity help friends, why do they not also in times of adversity offer their support? Let us aid by giving counsel, let us offer our best endeavours, let us sympathize with them with all our heart.
Notes and References
"... The Book of Ecclesiasticus [Sirach] has been honored still more highly among the Christians, being cited in the Epistle of James (Edersheim, in Wace, 'Apocrypha,' p. 21), the Didache (4:5), and the Epistle of Barnabas (19:9), while Clement of Alexandria and Origen quote from it repeatedly, as from a γραφή, or holy book. In the Western Church, Cyprian frequently appeals to it in his 'Testimonia,' as does Ambrose in the greater number of his writings. In like manner the Catalogue of Cheltenham, Damasus I., the Councils of Hippo (393) and Carthage (397), Pope Innocent I., the second Council of Carthage (419), and Augustine all regard it as a canonical book. This is contrary, however, to the opinions of the Council of Laodicea, of Jerome, and of Rufinus of Aquileia, which authorities rank it among the ecclesiastical books. It was finally declared canonical by the Council of Trent; and the favor with which the Church has always regarded it has preserved it in its entirety. ..."
Toy, Crawford Howell The Wisdom of Jesus the Son of Sirach (pp. 1-10) Jewish Encyclopedia, 2021