When Joseph's brothers arrived in Egypt to buy grain, what did they do before him?

Answer: Bowed down to the ground

Joseph was the ruler who sold grain to all the people, and his brothers bowed down before him with their faces to the ground.

“Now Joseph was the ruler of the land; he was the one who sold grain to all its people. So when his brothers arrived, they bowed down before him with their faces to the ground.”— Genesis 42:6 (BSB)