Genesis 21:5

5 when he was of an hundred years; for Isaac was born in this age of the father. (when he was a hundred years old; for this was the age of his father when Isaac was born.)

Genesis 21:5 Meaning and Commentary

Genesis 21:5

And Abraham was an hundred years old when son Isaac was born
unto him.
] So that this was years after his departure from Haran, and coming into the land of Canaan, for then he was seventy five years of age, ( Genesis 12:4 ) ; and this exactly agrees with the account of Demetrius, as related by Polyhistor, an Heathen writer ^F15, who makes Isaac to be born just twenty five years from Abraham's coming into the land of Canaan, and who must be now an hundred years old, being ninety nine at the time the Lord appeared unto him, and promised him a son at the set time the next year, ( Genesis 17:1 Genesis 17:21 ) . This is observed, both to show the wonderful favour to Abraham, and the faithfulness of God in the exact performance of his promise: according to Bishop Usher ^F16, Isaac was born A. M. 2108, and before Christ 1896, and probably at Beersheba, see ( Genesis 21:33 Genesis 21:34 ) .

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FOOTNOTES:

F15 Apud Euseb. Praepar. Evangel. l. 9. c. 21. p. 425.
F16 Annales Vet. Test. p. 9.

Genesis 21:5 In-Context

3 And Abraham called the name of his son, whom Sarah childed to him, Isaac.

4 And Abraham circumcised him in the eighth day, as God commanded to him, (And Abraham circumcised him on the eighth day, as God had commanded to him,)

5 when he was of an hundred years; for Isaac was born in this age of the father. (when he was a hundred years old; for this was the age of his father when Isaac was born.)

6 And Sarah said, The Lord hath made laughing to me (The Lord hath made me to laugh), and whoever shall hear (about this) shall laugh with me.

7 And again she said, Who should hear, and believe to Abraham (And she added, For who would have said to Abraham), that Sarah should give sucking to a son, whom she childed to him, (when he is) now an eld man?