Genesis 42:37-38

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

38But Jacob replied, “My son will not go down there with you, for his brother is dead and he alone is left. If an accident happens to him on the journey you have to make, then you will bring down my gray hair in sorrow to the grave.”