Genesis 42:37-38

37Then Reuben said to his father, “You may put both of my sons to death if I do not bring him back to you. Entrust him to my care, and I will bring him back.”

38But Jacob said, “My son will not go down there with you; his brother is dead and he is the only one left. If harm comes to him on the journey you are taking, you will bring my gray head down to the grave in sorrow.”