Ben Sira 27:17

17 Love thy friend, and be faithful unto him: but if thou betrayest his secrets, follow no more after him.

Ben Sira 27:17 In-Context

15 The strife of the proud is bloodshedding, and their revilings are grievous to the ear.
16 Whoso discovereth secrets loseth his credit; and shall never find friend to his mind.
17 Love thy friend, and be faithful unto him: but if thou betrayest his secrets, follow no more after him.
18 For as a man hath destroyed his enemy; so hast thou lost the love of thy neighbour.
19 As one that letteth a bird go out of his hand, so hast thou let thy neighbour go, and shalt not get him again
The King James Version is in the public domain.