Sirach 29:13

13 It shall fight for thee against thine enemies better than a mighty shield and strong spear.

Sirach 29:13 In-Context

11 Lay up thy treasure according to the commandments of the most High, and it shall bring thee more profit than gold.
12 Shut up alms in thy storehouses: and it shall deliver thee from all affliction.
13 It shall fight for thee against thine enemies better than a mighty shield and strong spear.
14 An honest man is surety for his neighbour: but he that is impudent will forsake him.
15 Forget not the friendship of thy surety, for he hath given his life for thee.

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