The children of Israel journey from Rameses to Succoth — about six hundred thousand men on foot, besides children. And a mixed multitude also went up with them: flocks and herds, very much livestock.
They baked the dough they had taken out of Egypt as unleavened cakes — because it had not leavened, since they had been driven out of Egypt and could not wait, and they had not prepared any provision for themselves.
The sojourning of the children of Israel in Egypt was four hundred and thirty years. At the end of four hundred and thirty years, on that very day, all the hosts of God went out from the land of Egypt.
It is a night of watching to God for bringing them out of the land of Egypt. This night is a night of watching to God for all the children of Israel throughout their generations.
The departure is not described as triumphant celebration — it is described as an exodus driven by urgency, carrying bread that didn't have time to rise, walking out under the night sky, toward a wilderness they had never entered. Freedom and uncertainty in the same step.