Sirach 15:15

15 If thou wilt, to keep the commandments, and to perform acceptable faithfulness.

Sirach 15:15 In-Context

13 The Lord hateth all abomination; and they that fear God love it not.
14 He himself made man from the beginning, and left him in the hand of his counsel;
15 If thou wilt, to keep the commandments, and to perform acceptable faithfulness.
16 He hath set fire and water before thee: stretch forth thy hand unto whether thou wilt.
17 Before man is life and death; and whether him liketh shall be given him.

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