9 But Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, playing with her son Isaac. 10 So she said to Abraham, "Cast out this slave woman with her son; for the son of this slave woman shall not inherit along with my son Isaac." 11 The matter was very distressing to Abraham on account of his son. 12 But God said to Abraham, "Do not be distressed because of the boy and because of your slave woman; whatever Sarah says to you, do as she tells you, for it is through Isaac that offspring shall be named for you. 13 As for the son of the slave woman, I will make a nation of him also, because he is your offspring."
14 So Abraham rose early in the morning, and took bread and a skin of water, and gave it to Hagar, putting it on her shoulder, along with the child, and sent her away. And she departed, and wandered about in the wilderness of Beer-sheba. 15 When the water in the skin was gone, she cast the child under one of the bushes. 16 Then she went and sat down opposite him a good way off, about the distance of a bowshot; for she said, "Do not let me look on the death of the child." And as she sat opposite him, she lifted up her voice and wept. 17 And God heard the voice of the boy; and the angel of God called to Hagar from heaven, and said to her, "What troubles you, Hagar? Do not be afraid; for God has heard the voice of the boy where he is. 18 Come, lift up the boy and hold him fast with your hand, for I will make a great nation of him." 19 Then God opened her eyes and she saw a well of water. She went, and filled the skin with water, and gave the boy a drink. 20 God was with the boy, and he grew up; he lived in the wilderness, and became an expert with the bow. 21 He lived in the wilderness of Paran; and his mother got a wife for him from the land of Egypt.
Matthew Henry's Commentary on Genesis 21:9-21
Commentary on Genesis 21:9-13
(Read Genesis 21:9-13)
Let us not overlook the manner in which this family matter instructs us not to rest in outward privileges, or in our own doings. And let us seek the blessings of the new covenant by faith in its Divine Surety. Ishmael's conduct was persecution, being done in profane contempt of the covenant and promise, and with malice against Isaac. God takes notice of what children say and do in their play; and will reckon with them, if they say or do amiss, though their parents do not. Mocking is a great sin, and very provoking to God. And the children of promise must expect to be mocked. Abraham was grieved that Ishmael should misbehave, and Sarah demand so severe a punishment. But God showed him that Isaac must be the father of the promised Seed; therefore, send Ishmael away, lest he corrupt the manners, or try to take the rights of Isaac. The covenant seed of Abraham must be a people by themselves, not mingled with those who were out of covenant: Sarah little thought of this; but God turned aright what she said.
Commentary on Genesis 21:14-21
(Read Genesis 21:14-21)
If Hagar and Ishmael had behaved well in Abraham's family, they might have continued there; but they were justly punished. By abusing privileges, we forfeit them. Those who know not when they are well off, will be made to know the worth of mercies by the want of them. They were brought to distress in the wilderness. It is not said that the provisions were spent, or that Abraham sent them away without money. But the water was spent; and having lost their way, in that hot climate Ishmael was soon overcome with fatigue and thirst. God's readiness to help us when we are in trouble, must not slacken, but quicken our endeavours to help ourselves. The promise concerning her son is repeated, as a reason why Hagar should bestir herself to help him. It should engage our care and pains about children and young people, to consider that we know not what great use God has designed them for, and may make of them. The angel directs her to a present supply. Many who have reason to be comforted, go mourning from day to day, because they do not see the reason they have for comfort. There is a well of water near them in the covenant of grace, but they are not aware of it, till the same God that opened their eyes to see their wound, opens them to see their remedy. Paran was a wild place, fit for a wild man; such as Ishmael. Those who are born after the flesh, take up with the wilderness of this world, while the children of the promise aim at the heavenly Canaan, and cannot be at rest till they are there. Yet God was with the lad; his outward welfare was owing to this.