There seems to be some variation in the exodus tradition regarding when the Israelites left Egypt. As we saw in the previous entry (#114), in the Elohist tradition although the Israelites were commanded to stay in their houses “until morning” it does seem that they nevertheless leave Egypt during that very evening. But this is certainly not clear from the text (Ex 12:31-34). They could have left in the morning, thereby remaining in their houses “until morning.”
Exodus 13:4 is no more clear: “Today you are going out from Egypt, in the month of Abib.” Yet the tradition recorded in Numbers 33:3 is quite clear on this matter: “And they traveled from Rameses in the first month on the 15th day of the first month. On the day after the Passover. the children of Israel went out with a high hand before the eyes of all Egypt.” This tradition relates that it was the day after the Passover, that is the morning of the 15th.
That said, Deuteronomy is also clear, except now it’s the evening of the Passover that the Israelites leave: “Yahweh your god brought you out of Egypt at night” (Deut 16:1).