Commentaries:
Adam Clarke
I will certainly return - Abraham was now ninety-nine years of age, and this promise was fulfilled when he was a hundred; so that the phrase according to the time of life must mean either a complete year, or nine months from the present time, the ordinary time of pregnancy. Taken in this latter sense, Abraham was now in the ninety-ninth year of his age, and Isaac was born when he was in his hundredth year.
Other Adam Clarke entries containing Genesis 18:10:
Romans 9:9
1 John 2:29
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