Sirach 19:12

12 As an arrow that sticketh in a man's thigh, so is a word within a fool's belly.

Sirach 19:12 In-Context

10 If thou hast heard a word, let it die with thee; and be bold, it will not burst thee.
11 A fool travaileth with a word, as a woman in labour of a child.
12 As an arrow that sticketh in a man's thigh, so is a word within a fool's belly.
13 Admonish a friend, it may be he hath not done it: and if he have done it, that he do it no more.
14 Admonish thy friend, it may be he hath not said it: and if he have, that he speak it not again.

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