Exodus 12:37-39

New Revised Standard Version, Anglicised Catholic Edition

³⁷ The Israelites journeyed from Rameses to Succoth, about six hundred thousand men on foot, besides children. ³⁸ A mixed crowd also went up with them, and livestock in great numbers, both flocks and herds. ³⁹ They baked unleavened cakes of the dough that they had brought out of Egypt; it was not leavened, because they were driven out of Egypt and could not wait, nor had they prepared any provisions for themselves.