Sirach 28:16

16 Whoso hearkeneth unto it shall never find rest, and never dwell quietly.

Sirach 28:16 In-Context

14 A backbiting tongue hath disquieted many, and driven them from nation to nation: strong cities hath it pulled down, and overthrown the houses of great men.
15 A backbiting tongue hath cast out virtuous women, and deprived them of their labours.
16 Whoso hearkeneth unto it shall never find rest, and never dwell quietly.
17 The stroke of the whip maketh marks in the flesh: but the stroke of the tongue breaketh the bones.
18 Many have fallen by the edge of the sword: but not so many as have fallen by the tongue.

The Brenton translation of the Septuagint is in the public domain.