Sirach 6:6-8

New Revised Standard Version, Anglicised Catholic Edition

⁶ Let those who are friendly with you be many,
    but let your advisers be one in a thousand.
⁷ When you gain friends, gain them through testing,
    and do not trust them hastily.
⁸ For there are friends who are such when it suits them,
    but they will not stand by you in time of trouble.