NET
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.
Darby
21 And Isaac entreated Jehovah for his wife, because she was barren; and Jehovah was entreated of him, and Rebecca his wife conceived.
KJV
21 And Isaac intreated the LORD for his wife, because she [was] barren: and the LORD was intreated of him, and Rebekah his wife conceived.