John Gills Exposition of the Bible Commentary - Genesis 21:7
And she said, who would have said unto Abraham ,.... No one a year ago could ever have thought of such a thing, much less have come and told Abraham that he should have a child or children by Sarah; the thing was incredible, and next to impossible; none but God himself, or an angel from him, could have declared this, as none but he could bring it about, the thing is so marvellous and astonishing: that Sarah should have given children suck ? that she who was ninety years of age should... read more
Matthew Henry's Complete Commentary - Genesis 21:1-8
Few under the Old Testament were brought into the world with such expectation as Isaac was, not for the sake of any great person eminence at which he was to arrive, but because he was to be, in this very thing, a type of Christ, that seed which the holy God had so long promised and holy men so long expected. In this account of the first days of Isaac we may observe, I. The fulfilling of God's promise in the conception and birth of Isaac, Gen. 21:1, 2. Note, God's providences look best and... read more