Genesis 21:14

But was the just Abraham inhumane in that he did not even supply Hagar and the boy with a donkey, with all the cattle he possessed?

Let us see what Abraham does meanwhile after Sarah is displeased. He casts out the bondwoman and her son, but nevertheless he gives him a bottle of water. For his mother does not have a well of living water, nor could the boy draw water from a well. Isaac has wells for which he also suffers strife against the Philistines, but Ishmael drinks water from a bottle. This bottle, as it is a bottle, fails, and therefore he is thirsty and does not find a well.But you, who are a son "of promise as Isaac," "drink water from your own fountains, and let not the waters flow forth from your wells, but let your waters run in your streets." But one "who is born according to the flesh" drinks water from a bottle, and the water itself fails him, and he lacks in many things. The bottle of the law is the letter, from which carnal people drink and thence receives understanding. This letter frequently fails them. It cannot extricate itself, for the historical understanding is defective in many things. But the church drinks from the evangelic and apostolic fountains that never fail but "run in its streets," because they always abound and flow in the breadth of spiritual interpretation. The church drinks also "from wells" when it draws and examines certain deeper things from the law. On account of this mystery also, I think, our Lord and Savior said to the Samaritan woman, when, as if he were speaking with Hagar herself he said, "Whoever shall drink of this water shall thirst again; but he who shall drink of the water which I give him shall not thirst forever." But she says to the Savior, "Sir, give me this water, that I may not thirst, nor come here to draw." After this the Lord says to her, "There shall come to be in him who believes in me a fountain of water springing up into life everlasting."

It was also submissive; it was contrary to his judgment, at least to his own inclination, to do it; yet as soon as he perceives that it is the mind of God he makes no objections, but silently does as he is bidden, as one trained up to an implicit obedience.

And Abraham rose up early in the morning,....

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.