The Birth of Isaac

1 Now the LORD was gracious to Sarah as he had said, and the LORD did for Sarah what he had promised.

Read Genesis 21:1 Using Other Translations

And the LORD visited Sarah as he had said, and the LORD did unto Sarah as he had spoken.
The LORD visited Sarah as he had said, and the LORD did to Sarah as he had promised.
The LORD kept his word and did for Sarah exactly what he had promised.