Genesis 21:10-14

Verse 10

Cast out this bondwoman and her son - Both Sarah and Abraham have been accused of cruelty in this transaction, because every word reads harsh to us. Cast out; גרש garash signifies not only to thrust out, drive away, and expel, but also to divorce; (see Lev 21:7); and it is in this latter sense the word should be understood here. The child of Abraham by Hagar might be considered as having a right at least to a part of the inheritance; and as it was sufficiently known to Sarah that God had designed that the succession should be established in the line of Isaac, she wished Abraham to divorce Hagar, or to perform some sort of legal act by which Ishmael might be excluded from all claim on the inheritance.
Verse 12

In Isaac shall thy seed be called - Here God shows the propriety of attending to the counsel of Sarah; and lest Abraham, in whose eyes the thing was grievous, should feel distressed on the occasion, God renews his promises to Ishmael and his posterity.
Verse 14

Took bread, and a bottle - By the word bread we are to understand the food or provisions which were necessary for her and Ishmael, till they should come to the place of their destination; which, no doubt, Abraham particularly pointed out. The bottle, which was made of skin, ordinarily a goat's skin, contained water sufficient to last them till they should come to the next well; which, it is likely, Abraham particularly specified also. This well, it appears, Hagar missed, and therefore wandered about in the wilderness seeking more water, till all she had brought with her was expended. We may therefore safely presume that she and her son were sufficiently provided for their journey, had they not missed their way. Travelers in those countries take only, to the present day, provisions sufficient to carry them to the next village or encampment; and water to supply them till they shall meet with the next well. What adds to the appearance of cruelty in this case is, that our translation seems to represent Ishmael as being a young child; and that Hagar was obliged to carry him, the bread, and the bottle of water on her back or shoulder at the same time. But that Ishmael could not be carried on his mother's shoulder will be sufficiently evident when his age is considered; Ishmael was born when Abraham was eighty-six years of age, Gen 16:16; Isaac was born when he was one hundred years of age, Gen 21:5; hence Ishmael was fourteen years old at the birth of Isaac. Add to this the age of Isaac when he was weaned, which, from Gen 21:8, (See note Gen 21:8) was probably three, and we shall find that Ishmael was at the time of his leaving Abraham not less than seventeen years old; an age which, in those primitive times, a young man was able to gain his livelihood, either by his bow in the wilderness, or by keeping flocks as Jacob did.
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