Genesis 21:16 - Ellicott's Commentary On The Whole Bible

Let me not see the death of the child. — The whole story is most touching. Day after day the mother, with her child, had wandered in the wilderness, using the water in the skin sparingly, ever hoping to come to some spring, but with too little knowledge of the locality to guide her steps wisely. At last the water is spent, and the young life withers first, and the mother knows that soon they both must die. They had made their last effort, and with that hopelessness which travellers have so often described as stealing over the lost wanderer in the desert, they yield themselves to their doom. The boy is entirely passive; but not so the mother. A softer nature would have remained with him to soothe him, but the agony of the wild Egyptian will grant her no rest. She casts his fainting body almost angrily under a shrub, and withdraws to a bowshot distance, because she cannot bear to see him die. She there gives way not to tears only, but to unrestrained outcries of grief. But it is not her loud lamentation, but the mute prayer of Ishmael that is heard, and an angel of God comes to her relief.