Exodus 12:40-42

40Now the sojourning of the children of Israel, who dwelt in Egypt, was four hundred and thirty years. 41And it came to pass at the end of the four hundred and thirty years, even the selfsame day it came to pass, that all the armies of Yhwh went out from the land of Egypt. 42It is a night to be much observed unto Yhwh for bringing them out from the land of Egypt: this is that night of Yhwh to be observed of all the children of Israel in their generations.1