Genesis 42:3-8

So Joseph’s ten brothers went down to buy grain in Egypt. But Jacob did not send Joseph’s brother Benjamin with his brothers, for he said, “Lest some calamity befall him.” And the sons of Israel went to buy grain among those who journeyed, for the famine was in the land of Canaan. Now Joseph was governor over the land; and it was he who sold to all the people of the land. And Joseph’s brothers came and bowed down before him with their faces to the earth. Joseph saw his brothers and recognized them, but he acted as a stranger to them and spoke roughly to them. Then he said to them, “Where do you come from?” And they said, “From the land of Canaan to buy food.” So Joseph recognized his brothers, but they did not recognize him.