Sirach 5:15

15 Be not ignorant of any thing in a great matter or a small.

Sirach 5:15 In-Context

13 Honour and shame is in talk: and the tongue of man is his fall.
14 Be not called a whisperer, and lie not in wait with thy tongue: for a foul shame is upon the thief, and an evil condemnation upon the double tongue.
15 Be not ignorant of any thing in a great matter or a small.

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