Genesis 42:3-6

Then ten of Joseph’s brothers went down to buy grain from Egypt. But Jacob did not send Benjamin, Joseph’s brother, with the others, because he was afraid that harm might come to him. So Israel’s sons were among those who went to buy grain, for there was famine in the land of Canaan also. Now Joseph was the governor of the land, the person who sold grain to all its people. So when Joseph’s brothers arrived, they bowed down to him with their faces to the ground.