John Gills Exposition of the Bible Commentary - Genesis 21:10
Wherefore she said unto Abraham, cast out this bondwoman and her son ,.... Hagar, Sarah's handmaid and bondservant, and her son Ishmael; by this it appears that Hagar was concerned in this affair, and set her son on to mock Isaac, at least she encouraged him in it, buoying: him up with his being the firstborn, and having a right to the inheritance; wherefore Sarah saw plainly that there would be no peace nor comfort for her and her son, unless Hagar and her son were turned out of doors, for... read more
John Gills Exposition of the Bible Commentary - Genesis 21:9
And Sarah saw the son of Hagar the Egyptian ,.... That is, Ishmael, who is not expressed by name, but described by being a son of Hagar, a servant of Sarah's, and an Egyptian woman; all which seems to be observed by way of slight, both to Hagar and her son: which she had born unto Abraham ; not unto Sarah, as she proposed to herself, when she gave her maid to Abraham, Genesis 16:2 . This son of Abraham she saw mocking ; either at the entertainment made at the weaning of Isaac; or... read more