New Revised Standard Version
By faith he received power of procreation, even though he was too old—and Sarah herself was barren—because he considered him faithful who had promised.

Contemporary English Version
Even when Sarah was too old to have children, she had faith that God would do what he had promised, and she had a son.

New American Bible
By faith he received power to generate, even though he was past the normal age—and Sarah herself was sterile—for he thought that the one who had made the promise was trustworthy.

Douay-Rheims Bible
By faith also Sara herself, being barren, received strength to conceive seed, even past the time of age: because she believed that he was faithful who had promised,

By faith also Sara herself, being barren, received strength to conceive seed, even past the time of age: because she believed that he was faithful who had promised,

Sara.

Genesis 17:17-19 Abraham fell upon his face, and laughed, saying in his heart: Shall a son, thinkest thou, be born to him that is a hundred years old? and shall Sara that is ninety years old bring forth? . . .

Genesis 18:11-14 Now they were both old, and far advanced in years, and it had ceased to be with Sara after the manner of women. . . .

Genesis 21:1,2 And the Lord visited Sara, as he had promised: and fulfilled what he had spoken. . . .

Luke 1:36 And behold thy cousin Elizabeth, she also hath conceived a son in her old age: and this is the sixth month with her that is called barren.

1 Peter 3:5,6 For after this manner heretofore, the holy women also who trusted in God adorned themselves, being in subjection to their own husbands: . . .

because.

Hebrews 10:23 Let us hold fast the confession of our hope without wavering (for he is faithful that hath promised):

Romans 4:20,21 In the promise also of God he staggered not by distrust: but was strengthened in faith, giving glory to God: . . .