Exodus 12:37

12:37 The Israelites journeyed from Rameses to Sukkoth. There were about 600,000 men on foot, plus their dependants.

Exodus 12:39

12:39 They baked cakes of bread without yeast using the dough they had brought from Egypt, for it was made without yeast – because they were thrust out of Egypt and were not able to delay, they could not prepare food for themselves either.