Numbers 22:1-4

Then the sons of Israel journeyed on, and camped in the plains of Moab beyond the Jordan opposite Jericho.

Now Balak the son of Zippor saw all that Israel had done to the Amorites.

So Moab was in great fear because of the people, for they were numerous; and Moab was in dread of the sons of Israel.

Moab said to the elders of Midian, “Now this horde will eat up all that is around us, as the ox eats up the grass of the field!” And Balak the son of Zippor was king of Moab at that time.