Numbers 22:7, 17-18

Balak’s messengers, who were elders of Moab and Midian, set out with money to pay Balaam to place a curse upon Israel. They went to Balaam and delivered Balak’s message to him.

I will pay you very well and do whatever you tell me. Just come and curse these people for me!” But Balaam responded to Balak’s messengers, “Even if Balak were to give me his palace filled with silver and gold, I would be powerless to do anything against the will of the LORD my God.