1:5 Seventy souls - According to the computation we had, Gen 46:27, including Joseph and his two sons. This was just the number of the nations by which the earth was peopled, Gen 10:1 - 32, for when God separated the sons of Adam, he set the bounds of the people according to the number of the children of Israel, De 32:8.
1:1-7 During more than 200 years, while Abraham, Isaac, and Jacob lived at liberty, the Hebrews increased slowly; only about seventy persons went down into Egypt. There, in about the same number of years, though under cruel bondage, they became a large nation. This wonderful increase was according to the promise long before made unto the fathers. Though the performance of God's promises is sometimes slow, it is always sure.