Joshua 24:9
"Then Balak the son of Zippor, king of Moab, arose and warred against Israel, and sent and called Balaam the son of Beor to curse you:"
Cross References (ranked by relevance)
Judges 11:25
And now art thou any thing better than Balak the son of Zippor, king of Moab? did he ever strive against Israel, or did he ever fight against them,
Micah 6:5
O my people, remember now what Balak king of Moab consulted, and what Balaam the son of Beor answered him from Shittim unto Gilgal; that ye may know the righteousness of the LORD.
Numbers 22:2
And Balak the son of Zippor saw all that Israel had done to the Amorites.