Matthew Henry's Complete Bible Commentary

Genesis 21

In this chapter we have, I. Isaac, the child of promise born into Abraham’s family, Genesis 21:1-21:8. II. Ishmael, the son of the bondwoman, cast out of it, Genesis 21:9-21:21. III. Abraham’s league with his neighbour Abimelech, Genesis 21:23-21:32. IV. His devotion to his God, Genesis 21:33. MHBCC 22.1

Long-looked-for comes at last. The vision concerning the promised seed is for an appointed time, and now, at the end, it speaks, and does not lie. MHBCC 22.2