Genesis 42:16

Send one of you, and let him fetch your brother, and ye shall be kept in prison, that your words may be proved, whether there be any truth in you: or else by the life of Pharaoh surely ye are spies.

Cross-reference

Genesis 42:19 modifies the imprisonment — from all three days to one brother staying — a narrative shift from verse 16's blanket custody.

Genesis 42:9 Historical context

In Genesis 42:9, Joseph recalls his dreams of brothers bowing—revealing his hidden motive for the test in verse 16.

In Genesis 42:15, the test condition is set: they must bring the youngest brother. Verse 16 then implements that condition.

In Genesis 44:2, Joseph again tests his brothers with the silver cup—a parallel testing strategy to the one in verse 16.