Sara.

Genesis 17:17-19
Abraham fell facedown. Then he laughed and said to himself, "Can a child be born to a man who is a hundred years old? Can Sarah give birth at the age of ninety?" . . .

Genesis 18:11-14
And Abraham and Sarah were already old and well along in years. Sarah had passed the age of childbearing. . . .

Genesis 21:1, 2
Now the LORD attended to Sarah as He had said, and the LORD did for Sarah what He had promised. . . .

Luke 1:36
Look, even Elizabeth your relative has conceived a son in her old age, and she who was called barren is in her sixth month.

1 Peter 3:5, 6
For this is how the holy women of the past adorned themselves. They put their hope in God and were subject to their husbands, . . .

because.

Hebrews 10:23
Let us hold resolutely to the hope we profess, for He who promised is faithful.

Romans 4:20, 21
Yet he did not waver through disbelief in the promise of God, but was strengthened in his faith and gave glory to God, . . .