Exodus 12:37-40

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

38A mixed multitude also went up with them, and flocks and herds – a very large number of cattle.

39They 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.

40Now the length of time the Israelites lived in Egypt was 430 years.