Now this matter distressed Abraham greatly because it concerned his son Ishmael.
11. And the thing was very grievous in Abraham’s sight . Although Abraham had been already assured, by many oracles, that the blessed seed should proceed from Isaac only; yet, under the influence of paternal affection, he could not bear that Ishmael should be cut off, for the purpose of causing the inheritance to remain entire to him, to whom it had been divinely granted...
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.
Commenting on Genesis 21:9-13
And God said unto Abraham,.... Either by an articulate voice, or by an impulse on his mind, suggesting to him what he should do, being no doubt in great perplexity how to conduct between his wife and his son, but God determines the case for him, and makes him easy: let it not be grievous in thy sight because of the lad, and because of...