The just shall live by FAITH.   Romans 1:16,17.
In Paul's letter to the Romans he writes:  "For I am not ashamed of the Gospel of Christ, for it is the power of God to salvation for every one who believes, for the Jew first and also for the Greek.  For in it the righteousness of God is revealed from FAITH to FAITH".  Romans 1:16,17.

In Paul's letter to the Hebrews he writes:  "But without FAITH it is impossible to please Him, for he who  comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him".   Hebrews 11:6.