John Gills Exposition of the Bible Commentary - Genesis 21:11
And the thing was very grievous in Abraham's sight ,.... The motion that Sarah made to turn out of his house Hagar and Ishmael was not agreeable to him, but the reverse; it seemed an ill thing to him; it was greatly displeasing to him, and he was unwilling to come into it: because of his son ; his son Ishmael; not grieved and uneasy for what he had done; not for committing idolatry, as the Targum of Jonathan suggests, or for mocking at Isaac; but for what was proposed to be done to him,... read more
Matthew Henry's Complete Commentary - Genesis 21:9-13
The casting out of Ishmael is here considered of, and resolved on. I. Ishmael himself gave the occasion by some affronts he gave to Isaac his little brother, some think on the day that Abraham made the feast for joy that Isaac was safely weaned, which the Jews say was not till he was three years old, others say five. Sarah herself was an eye-witness of the abuse: she saw the son of the Egyptian mocking (Gen. 21:9), mocking Isaac, no doubt, for it is said, with reference to this (Gal. 4:29),... read more