Proverbs 18:17 in the World English Bible
He who pleads his cause first seems right— until another comes and questions him.
Context
16 A man’s gift maketh room for him, and bringeth him before great men.
17 He that is first in his own cause seemeth just; but his neighbour cometh and searcheth him.
18 The lot causeth contentions to cease, and parteth between the mighty.