Genesis 42:37

And Reuben spake unto his father, saying, Slay my two sons, if I bring him not to thee: deliver him into my hand, and I will bring him to thee again.

Cross-reference

In Genesis 43:9, Judah offers himself as surety for Benjamin, mirroring Reuben's earlier offer of his sons. Both brothers pledge security for the boy.

In Genesis 44:32-34, Judah's plea to substitute himself for Benjamin parallels Reuben's offer of his sons as surety. Same theme of substitution.

Genesis 46:9 Historical context

In Genesis 46:9, Reuben's sons are listed by name—the very sons he offered to slay. Provides context for his rash vow.