Romans 4:19-25

19 He did not weaken in faith when he considered his own body, which was as good as dead because he was about a hundred years old, or when he considered the barrenness of Sarah's womb.
20 No distrust made him waver concerning the promise of God, but he grew strong in his faith as he gave glory to God,
21 fully convinced that God was able to do what he had promised.
22 That is why his faith was "reckoned to him as righteousness."
23 But the words, "it was reckoned to him," were written not for his sake alone,
24 but for ours also. It will be reckoned to us who believe in him that raised from the dead Jesus our Lord,
25 who was put to death for our trespasses and raised for our justification.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.