(1.) That it shall greatly multiply, and the numbers of it be increased; it shall be as the sand of the sea, which cannot be measured nor numbered. Though Israel according to the flesh be diminished and made few, the spiritual Israel shall be numerous, shall be innumerable. In the vast multitudes that by the preaching of the gospel have been brought to Christ, both in the first ages of Christianity and ever since, this promise is fulfilled, thousands out of every tribe in Israel, and out of other nations, a multitude which no man can number, Rev. vii. 4, 9; Gal. iv. 27. In this the promise made to Abraham, when God called him Abraham the high father of a multitude, had its full accomplishment (Gen. xvii. 5), and that Gen. xxii. 17. Some observe that they are here compared to the sand of the sea, not only for their numbers, but as the sand of the sea serves for a boundary to the waters, that they shall not overflow the earth, so the Israelites indeed are a wall of defence to the places where they live, to keep off judgments. God can do nothing against Sodom while Lot is there.