Proverbs 27:2 in the World English Bible
Let another man praise you, and not your own mouth; a stranger, and not your own lips.
Context
1 Boast not thyself of to morrow; for thou knowest not what a day may bring forth.
2 Let another man praise thee, and not thine own mouth; a stranger, and not thine own lips.
3 A stone is heavy, and the sand weighty; but a fool’s wrath is heavier than them both.