And the man was watching her, keeping silent, in order to know whether Jehovah had prospered his journey or not.

and he saith unto me, Jehovah, before whom I have walked habitually, doth send His messenger with thee, and hath prospered thy way, and thou hast taken a wife for my son from my family, and from the house of my father;

And he said to them, Do not hinder me, seeing Jehovah has prospered my way: send me away, and I will go to my master.

Therefore the man Jacob prospered so much that he had large flocks, female and male servants, as well as camels and donkeys.

The prison warden did not have to worry about anything under Joseph's care, because the LORD was with him. That's why Joseph prospered in everything he did.