Sirach 6:16LXX

14A faithful friend is a strong defence: and he that hath found him, hath found a treasure.

15Nothing can be compared to a faithful friend, and no weight of gold and silver is able to countervail the goodness of his fidelity.

16A faithful friend is the medicine of life and immortality: and they that fear the Lord, shall find him.

17He that feareth God, shall likewise have good friendship: because according to him shall his friend be.

18My son, from thy youth up receive instruction, and even to thy grey hairs thou shalt find wisdom.