Bereshis 21:1-3 Orthodox Jewish Bible (OJB)
21 And Hashem visited Sarah as He had said, and Hashem did unto Sarah just as He had spoken.
2 For Sarah conceived, and bore Avraham ben in his old age, at the mo’ed (set time) of which Elohim had given promise unto him.
3 And Avraham called the shem of bno that was born unto him, whom Sarah bore to him, Yitzchak.
Genesis 21:1-3 New International Version (NIV)
The Birth of Isaac
21 Now the Lord was gracious to Sarah as he had said, and the Lord did for Sarah what he had promised. 2 Sarah became pregnant and bore a son to Abraham in his old age, at the very time God had promised him. 3 Abraham gave the name Isaac[a] to the son Sarah bore him.