Sirach 20:6

6 Some man holdeth his tongue, because he hath not to answer: and some keepeth silence, knowing his time.

Sirach 20:6 In-Context

4 As is the lust of an eunuch to deflower a virgin; so is he that executeth judgment with violence.
5 There is one that keepeth silence, and is found wise: and another by much babbling becometh hateful.
6 Some man holdeth his tongue, because he hath not to answer: and some keepeth silence, knowing his time.
7 A wise man will hold his tongue till he see opportunity: but a babbler and a fool will regard no time.
8 He that useth many words shall be abhorred; and he that taketh to himself authority therein shall be hated.

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