Moses
Genesis 21:5BSB·traditional attribution

Abraham was a hundred years old when his son Isaac was born to him.

John Calvin Reformed @genevareformer

5. And Abraham was an hundred years old . Moses again records the age of Abraham the better to excite the minds of his readers to a consideration of the miracle. And although mention is made only of Abraham, let us yet remember that he is, in this place, set before us, not as a man of lust, but as the husband of Sarah, who...

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 Sarah said, God hath made me to laugh,.... This she said on occasion of the name of her son Isaac, which name her husband had given him by divine direction, and to which she assented. This doubtless brought to her mind her former laughing, when she first heard that she should have a son, which was in a way of diffidence and distrust; but...