Genesis 42:3

And Joseph's ten brethren went down to buy corn in Egypt.
] They obeyed their father's orders, and immediately set out for Egypt; "ten" of them went down in a body together, all but Benjamin, so that it is easily reckoned who they were, and they are called not Jacob's sons, as they were; but Joseph's brethren, whom they had sold into Egypt, and to whom now they were going, though they knew it not, to buy corn of him in their necessity, and to whom they would be obliged to yield obeisance, as they did.