Sirach 6:13

13 Separate thyself from thine enemies, and take heed of thy friends.

Sirach 6:13 In-Context

11 But in thy prosperity he will be as thyself, and will be bold over thy servants.
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.

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