What Does Genesis 42:16 Mean?

"Send one of you, and let him bring your brother, while you remain confined, that your words may be tested, whether there is truth in you. Or else, by the life of Pharaoh, surely you are spies." Joseph's first version of the test is: one brother goes back to Canaan to fetch Benjamin while the other nine remain in Egyptian custody. This version of the test is more severe than what he will eventually implement (three days in prison, then nine go and one stays). The initial design: nine confined while one travels: is the harsher option, and the three-day imprisonment of verse 17 functions as a cooling-off period before the modified version of verse 18 to 20.

"That your words may be tested, whether there is truth in you": Joseph names the purpose of the requirement explicitly. The test is a truth test. He does not say "to confirm your identity" but "to test whether there is truth in you." The question about the brothers is not whether they exist or whether there is a Benjamin: Joseph already knows the answer to both. The question is whether they tell the truth about their situation and whether they will act faithfully on behalf of the youngest brother. Whether there is truth "in them" is the moral question about their character, not the factual question about their family.

"Or else, by the life of Pharaoh, surely you are spies": the alternative to producing Benjamin is being declared spies definitively and suffering the legal consequences. The oath is now used in both directions: by Pharaoh's life, you shall not leave without Benjamin (v.15), and by Pharaoh's life, if you don't produce Benjamin, you are spies (v.16). The double oath seals both ends of the test's conditions. The brothers are under maximum pressure with no escape route: they must either comply or face condemnation. This is, again, precisely the situation of powerless accusation that they created for Joseph.