By faith Sarah, even though she was barren and beyond the proper age, was enabled to conceive a child, because she considered Him faithful who had promised.
KJV
Through faith also Sara herself received strength to conceive seed, and was delivered of a child when she was past age, because she judged him faithful who had promised.
ASV
By faith even Sarah herself received power to conceive seed when she was past age, since she counted him faithful who had promised: