What did God say He would send ahead of Israel to drive out the Hivites, Canaanites and Hittites?

Answer: Hornets

God promised, "I will send the hornet before you to drive the Hivites and Canaanites and Hittites out of your way" (KJV: "hornets").

“I will send the hornet before you to drive the Hivites and Canaanites and Hittites out of your way.”— Exodus 23:28 (BSB)