Sirach 9:18

18 A man of an ill tongue is dangerous in his city; and he that is rash in his talk shall be hated.

Sirach 9:18 In-Context

16 And let just men eat and drink with thee; and let thy glorying be in the fear of the Lord.
17 For the hand of the artificer the work shall be commended: and the wise ruler of the people for his speech.
18 A man of an ill tongue is dangerous in his city; and he that is rash in his talk shall be hated.

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