Genesis 42:18 - Matthew Poole's English Annotations on the Holy Bible

I will spare your lives, and not punish you with death as spies, and you shall carry provisions, that your family also may live; for I fear God, and therefore will not be cruel to you, nor to your brother whom you shall leave with me. This might have raised some suspicion concerning Joseph, but that they knew there were divers among the heathens who did own the true God, though they worshipped idols with him.