Genesis 42:18
On the third day Joseph issues a new directive and frames compliance as life-preserving. His statement about fearing God functions rhetorically within the negotiation.
Genesis 42:19
If they are , one brother will remain confined while the rest travel with grain to relieve famine pressure on their households.
Genesis 42:20
They must the youngest brother to Joseph on their return so their can be verified; the stated outcome is continued survival. The brothers accept the arrangement.