Moses
Genesis 21:7ESV·traditional attribution

And she said, “Who would have said to Abraham that Sarah would nurse children? Yet I have borne him a son in his old age.”

John Calvin Reformed @genevareformer

7. Who would have said unto Abraham, that Sarah should have given children suck ? I understand the future tense to be here put for the subjunctive mood. And the meaning is, that such a thing would never have entered into the mind of any one.

Matthew Henry Presbyterian @wholebiblehenry

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; few under the Old Testament were brought into the world with such expectation as Isaac was, not for the sake of any great person eminence at which he was to arrive, but because he was to be, in this...

Commenting on Genesis 21:1-8

John Gill Reformed Baptist @doctorgill

And the child grew, and was weaned,.... He throve under the nursing of its mother, and through the blessing of God upon him; and being healthy and robust, and capable of digesting stronger food, and living upon it, he was weaned from the breast: at what age Isaac was when weaned is not certain, there being no fixed time for such an affair, but it...