Genesis 43:3

Judah spoke on behalf of all the brothers. We would expect that Reuben would do this. Reuben was the oldest brother. And, before this time, Reuben was the most responsible brother. (See Genesis 37:21.) But Judah became the leader. And, later, Jacob dealt with Judah as if he was the oldest. (See Genesis 49:8 and the comment.)