“And the children of Israel were fruitful, and increased abundantly, and multiplied, and waxed exceeding mighty; and the land was filled with them.”
King James Version (KJV)
1:7 And the children of Israel were fruitful, and increased abundantly - Like fishes or insects, so that they multiplied; and being generally healthful and strong, they waxed exceeding mighty, so that the land was filled with them, at least Goshen, their own allotment. This wonderful increase was the product of the promise long before made to the fathers. From the call of Abraham, when God first told him he would make him a great nation, to the deliverance of his seed out of Egypt, was 430 years; during the first 215 of which, they were increased to 70, but in the latter half, those 70 multiplied to 600,000 fighting men.