Exodus 1:7 - Joseph Benson’s Commentary on the Old and New Testaments

And the children of Israel were fruitful, and increased abundantly Like fishes or insects, as one of the words here used signifies, 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 their 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, were four hundred and thirty years; during the first two hundred and fifteen of which they were increased to seventy, but in the latter half, those seventy multiplied to six hundred thousand fighting men.