fell upon his face See Genesis 17:3.

laughed The incredulous laughter of Abraham here, according to P, should be compared with that of Sarah, in Genesis 18:12, according to J, as a play upon the name "Isaac" and its meaning of "laughter."

Along with the incredulity must be reckoned the joy of the assurance that the promise of a son should be fulfilled. The joy of that hope, and of its significance to the whole world, is the subject of the allusion in, John 8:56, "Your father Abraham rejoiced to see my day, and he saw it and was glad."

ninety years old The age of Sarah, nine years younger (cf. Genesis 17:24) than Abraham.

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