Genesis 21:5

5 Now Abraham was a hundred years old when the birth of Isaac took place.

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 gave to his son, to whom Sarah had given birth, the name Isaac.

4 And when his son Isaac was eight days old, Abraham made him undergo circumcision, as God had said to him.

5 Now Abraham was a hundred years old when the birth of Isaac took place.

6 And Sarah said, God has given me cause for laughing, and everyone who has news of it will be laughing with me.

7 And she said, Who would have said to Abraham that Sarah would have a child at her breast? for see, I have given him a son now when he is old.