Genesis 42:3-8

So ten of Joseph’s brothers went down to buy grain from Egypt. But Jacob did not send Benjamin, Joseph’s brother, with them, because he was afraid that something terrible might happen to him. Along with many other people, the sons of Israel went to Egypt to buy grain, because the people in the land of Canaan were also hungry. Now Joseph was governor over Egypt. He was the one who sold the grain to people who came to buy it. So Joseph’s brothers came to him and bowed facedown on the ground before him. When Joseph saw his brothers, he knew who they were, but he acted as if he didn’t know them. He asked unkindly, “Where do you come from?” They answered, “We have come from the land of Canaan to buy food.” Joseph knew they were his brothers, but they did not know who he was.