Genesis 21:2-3

21:2 So Sarah became pregnant ¹  and bore Abraham a son in his old age at the appointed time that God had told him. 21:3 Abraham named his son – whom Sarah bore to him – Isaac. ² 

Matthew 1:2

1:2 Abraham was the father ³  of Isaac, Isaac the father of Jacob, Jacob the father of Judah and his brothers,

Luke 3:34

3:34 the son of Jacob, the son of Isaac, the son of Abraham, the son of Terah, ⁴  the son of Nahor,

Acts 7:8

7:8 Then God ⁵  gave Abraham ⁶  the covenant ⁷  of circumcision, and so he became the father of Isaac and circumcised him when he was eight days old, ⁸  and Isaac became the father of ⁹  Jacob, and Jacob of the twelve patriarchs. ¹⁰ 

[21:2]  ¹ tn Or “she conceived.”

[21:3]  ² tn Heb “the one born to him, whom Sarah bore to him, Isaac.” The two modifying clauses, the first introduced with an article and the second with the relative pronoun, are placed in the middle of the sentence, before the name Isaac is stated. They are meant to underscore that this was indeed an actual birth to Abraham and Sarah in fulfillment of the promise.

[1:2]  ³ tn Grk “fathered.”

[3:34]  ⁴ sn The list now picks up names from Gen 11:10-26; 5:1-32; 1 Chr 1:1-26, especially 1:24-26.

[7:8]  ⁵ tn Grk “he”; the referent (God) has been specified in the translation for clarity.

[7:8]  ⁶ tn Grk “him”; the referent (Abraham) has been specified in the translation for clarity.

[7:8]  ⁷ sn God gave…the covenant. Note how the covenant of promise came before Abraham’s entry into the land and before the building of the temple.

[7:8]  ⁸ tn Grk “circumcised him on the eighth day,” but many modern readers will not understand that this procedure was done on the eighth day after birth. The temporal clause “when he was eight days old” conveys this idea more clearly. See Gen 17:11-12.

[7:8]  ⁹ tn The words “became the father of” are not in the Greek text due to an ellipsis, but must be supplied for the English translation. The ellipsis picks up the verb from the previous clause describing how Abraham fathered Isaac.

[7:8]  ¹⁰ sn The twelve patriarchs refers to the twelve sons of Jacob, the famous ancestors of the Jewish race (see Gen 35:23-26).