Sirach 6:14

14 A faithful friend is a strong defence: and he that hath found such an one hath found a treasure.

Sirach 6:14 In-Context

12 If thou be brought low, he will be against thee, and will hide himself from thy face.
13 Separate thyself from thine enemies, and take heed of thy friends.
14 A faithful friend is a strong defence: and he that hath found such an one hath found a treasure.
15 Nothing doth countervail a faithful friend, and his excellency is invaluable.
16 A faithful friend is the medicine of life; and they that fear the Lord shall find him.

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