Wisdom of Ben Sira 6:7-9

New Catholic Bible

⁷ When you wish to acquire a new friend, first test him,
    and do not be too hasty to trust him.
⁸ One type of person is only a friend when it suits him,
    but at the first sign of trouble he will desert you.
⁹ Another type of friend will eventually become your enemy
    and shame you by making public your quarrel.