Genesis 42:3-8

So ten of Joseph’s brothers went down to buy grain in Egypt. But Jacob did not send Benjamin, Joseph’s [younger] brother, with his brothers, for he said, “I am afraid that some harm or injury may come to him.” So the sons of Israel came [to Egypt] to buy grain along with the others who were coming, for famine was in the land of Canaan also. Now Joseph was the ruler over the land, and he was the one who sold [grain] to all the people of the land; and Joseph’s [half] brothers came and bowed down before him with their faces to the ground. When Joseph saw his brothers he recognized them, but [hiding his identity] he treated them as strangers and spoke harshly to them. He said to them, “Where have you come from?” And they said, “From the land of Canaan, to buy food.” Joseph recognized his brothers, but they did not recognize him.