Hebrews 11:11

By faith also that very Sarah, who was barren, received ability for the conception of seed, and past the usual time of life brought forth a child, because she accounted that he who promised it, would be true to his promise.

Hebrews 10:23

let us hold fast the profession of hope unwavering, (for he who promises is faithful.)

Luke 1:36

And, behold, Elisabeth thy cousin, she also hath conceived in her old age: and this is the fifth month [of pregnancy] with her who was called barren.

Romans 4:20-21

for he disputed not against the promise of God with unbelief; but was mighty in faith, giving glory to God;

1 Peter 3:5-6

For so in times of old the holy women also, who hoped in God, adorned themselves, being in subjection to their own husbands;

Treasury of Scripture Knowledge

Summary

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.

Bible References

Sara

Luke 1:36
And, behold, Elisabeth thy cousin, she also hath conceived in her old age: and this is the fifth month [of pregnancy] with her who was called barren.
1 Peter 3:5
For so in times of old the holy women also, who hoped in God, adorned themselves, being in subjection to their own husbands;

Because

Hebrews 10:23
let us hold fast the profession of hope unwavering, (for he who promises is faithful.)
Romans 4:20
for he disputed not against the promise of God with unbelief; but was mighty in faith, giving glory to God;