Heb.11.11

By faith, barren Sarah was able to become pregnant, old woman as she was at the time, because she believed the One who made a promise would do what he said.

Heb.11.11

By faith Abraham, even though he was past age--and Sarah herself was barren--was enabled to become a father because he considered him faithful who had made the promise.

Heb.11.11

By faith Sarah herself also received strength to conceive seed, and she bore a child when she was past the age, because she judged Him faithful who had promised.

Heb.11.11

It was by faith that Sarah together with Abraham was able to have a child, even though they were too old and Sarah was barren. Abraham believed that God would keep his promise.