the faith of Abraham

Romans 4:

1  What shall we say then that Abraham our father, as pertaining to the flesh, hath found?

 2For if Abraham were justified by works, he hath ^bwhereof to glory; but not before God.

 3For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness.

18Who against hope believed in hope, that he might become the father of many nations, according to that which was spoken, So shall thy seed be.

 19And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sara’s womb:

 20He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God;

 21And being fully persuaded that, what He had promised, He was able also to perform.

Hebrews 11:

17By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son,

 18Of whom it was said, That in Isaac shall thy seed be called:

 19Accounting that God was able to raise him up, even from the dead; from whence also he received him in a figure.

Romans 4: 1-3, 18-21; Hebrews 11: 17-19 (emphasis added)