Exodus 12:37-39

The Israelites moved on from Rameses to Succoth, about 600,000 on foot, besides their dependents. Hebrews and non-Hebrews alike set out, not to mention the large flocks and herds of livestock. They baked unraised cakes with the bread dough they had brought out of Egypt; it hadn’t raised—they’d been rushed out of Egypt and hadn’t time to fix food for the journey.