Sirach 29:15

15 Forget not the friendship of thy surety, for he hath given his life for thee.

Sirach 29:15 In-Context

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.
16 A sinner will overthrow the good estate of his surety:
17 And he that is of an unthankful mind will leave him that delivered him.

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