Genesis 42:11

Now when Jacob saw that there was corn in Egypt, Jacob said unto his sons, Why do ye look one upon another?

And he said, Behold, I have heard that there is corn in Egypt: get you down thither, and buy for us from thence; that we may live, and not die.

And Joseph's ten brethren went down to buy corn in Egypt.

But Benjamin, Joseph's brother, Jacob sent not with his brethren; for he said, Lest peradventure mischief befall him.