Genesis 25:21

21 Isaac prayed to the LORD on behalf of his wife, because she was childless. The LORD answered his prayer, and his wife Rebekah became pregnant.

Read Genesis 25:21 Using Other Translations

And Isaac intreated the LORD for his wife, because she was barren: and the LORD was intreated of him, and Rebekah his wife conceived.
And Isaac prayed to the LORD for his wife, because she was barren. And the LORD granted his prayer, and Rebekah his wife conceived.
Isaac pleaded with the LORD on behalf of his wife, because she was unable to have children. The LORD answered Isaac’s prayer, and Rebekah became pregnant with twins.