The Targum Pseudo-Jonathan on Exodus 13:19 tells a story the Hebrew only hints at. Moses, on the night Israel leaves Egypt, is not packing or leading. He is recovering a body.
Joseph had made Israel swear a double oath on his deathbed (Genesis 50:25). "God will surely remember you, and you shall carry up my bones with you." Centuries passed. The Egyptians, according to older midrash reflected in the Targum, had sunk Joseph's metal coffin into the Nile (Nilos), partly to sanctify the river, partly to ensure no Hebrew could ever take it out.
And so, on the night of nights, while the rest of Israel plunders Egypt and gathers lambs, Moses walks to the riverbank. The Targum says he "carried up the ark in which were the bones of Joseph, from out of the Nilos, and took them with him." The word ark here is the same teva as Noah's ark and the basket that held baby Moses—a floating casket raised from the water.
The detail matters. The liberation of Israel begins not with weapons but with a promise kept. Moses, the greatest prophet, spends the night of freedom fulfilling the last request of a man dead for over two hundred years.
Takeaway: the Targum teaches that redemption carries the bones of the ancestors with it, and that freedom is inseparable from loyalty to the dead.