Which feast remembers the LORD passing over Israel's houses in Egypt?

Answer: Passover

The Passover sacrifice honors the LORD, who passed over the Israelites' houses in Egypt when He struck down the Egyptians.

“you are to reply, ‘It is the Passover sacrifice to the LORD, who passed over the houses of the Israelites in Egypt when He struck down the Egyptians and spared our homes.’” Then the people bowed down and worshiped.”— Exodus 12:27 (BSB)