Exodus 23:8 "You shall take no bribe, for a bribe blinds those who have sight and perverts the words of the righteous. (WEB NAS RSV NIV)
Deuteronomy 16:19 Thou shalt not wrest judgment; thou shalt not respect persons; neither shalt thou take a gift; for a gift doth blind the eyes of the wise, and pervert the words of the righteous. (See NAS RSV NIV)