Genesis 39:22-23

"And the keeper of the prison committed to Joseph's hand all the prisoners that were in the prison; and whatsoever they did there, he was the doer of it. The prison keeper looked not to anything that was under his hand, because Jehovah was with him; and that which he did, Jehovah made it to prosper."

"Jehovah was with him ..." This dominant note in the narrative is struck half a dozen times in twenty-three verses, and herein lies the explanation of all the remarkable happenings recorded. This chapter, as a key part of the story of Jacob and his posterity, relates the providential circumstances that eventually led to the removal of the entire Chosen Nation into Egypt, where the natural aversion of the people to all foreigners, especially if they were sheepherders, made it a practical impossibility for God's people easily to contract marriages with the pagan population, and where their eventual slavery compelled them to grow from within, to become a separate nation of very great numbers and to be cohesively bound together by the very circumstances in which God placed them. This concerned every single member of the whole of Israel, and not merely Joseph.