Genesis 17:17

17 Then Abraham bowed down with his face to the ground and laughed
Laughed. The Hebrew verb used here provides the basis for the naming of Isaac: “And he laughed” is וַיִּצְחָק (vayyitskhaq); the name “Isaac” is יִצְחָק (yitskhaq), “he laughs.” Abraham’s (and Sarah’s, see 18:12) laughter signals disbelief, but when the boy is born, the laughter signals surprise and joy.
as he said to himself,
Heb “And he fell on his face and laughed and said in his heart.”
“Can
The imperfect verbal form here carries a potential nuance, as it expresses the disbelief of Abraham.
a son be born to a man who is a hundred years old?
Heb “to the son of a hundred years.”
Can Sarah
It is important to note that even though Abraham staggers at the announcement of the birth of a son, finding it almost too incredible, he nonetheless calls his wife Sarah, the new name given to remind him of the promise of God (v. 15).
bear a child at the age of ninety?”
Heb “the daughter of ninety years.”
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