Romans 4:5 comes to mind. "But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness."
John 6:28-29 comes to mind:
28 They said therefore unto him, What must we do, that we may work the works of God?
29 Jesus answered and said unto them, This is the work of God, that ye believe on him whom he hath sent. Jn 6