Romans 4:5

"But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness."

Romans 4:20

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

Romans 4:21

"And being fully persuaded that, what he had promised, he was able also to perform."

Romans 4:22

"And therefore it was imputed to him for righteousness."