Proverbs 27:2 in the King James Version
Let another man praise thee, and not thine own mouth; a stranger, and not thine own lips.
Context
1 Don’t boast about tomorrow; for you don’t know what a day may bring.
2 Let another man praise you, and not your own mouth; a stranger, and not your own lips.
3 A stone is heavy, and sand is a burden; but a fool’s provocation is heavier than both.