Numbers 22:18-20

18But Balaam replied to the servants of Balak, “1Even if Balak were to give me his house full of silver and gold, I could not do anything, either small or great, contrary to the 2command of the Lord my God. 19Now please, you also stay here tonight, and I will find out what else the Lord will say to me.” 20And God came to Balaam at night and said to him, “If the men have come to call you, rise and go with them; but you shall do 3only the thing that I tell you.”