What does Genesis 42:37 mean?
Jacob has responded to news that one of his sons, Simeon, is held prisoner. His response is bitter, angrily accusing these nine for his loss of both Joseph (Genesis 37:28–33) and Simeon (Genesis 42:36). As we will see later, Jacob has no intention of risking Benjamin, even if that means abandoning Simeon to his fate (Genesis 42:38).Reuben, the oldest son, responds with a grand gesture. He begs his father to trust him with Benjamin's life. He offers to allow Jacob to kill his own two sons—a parallel with the two Jacob feels he has lost—if he fails to bring Benjamin back. This likely reflects his own guilt about lying to Jacob about Joseph's death all those years earlier. His vow is not necessarily meant to be literal, but more likely an oath showing how serious he is.
And yet, this follows a pattern where Reuben tries to atone for sleeping with his father's concubine (Genesis 35:22). It was Reuben who kept the others from killing Joseph outright (Genesis 37:22), planning to rescue him later. Reuben is the one who recognized the brothers' collective guilt when Simeon was taken (Genesis 42:21–22). This, again, is a bold attempt to prove himself to the family.