John chapter 20, vs 31 

 … believe that Jesus is the Christ … the Son of God … and … by believing … you will have life in His Name …

Romans chapter 3, vs 22 

 … righteousness from God … comes through faith in Jesus Christ … to all who believe … for … all have sinned and fallen short of the glory of God … so … we … are justified … freely … by His grace … through the redemption … that came by … Jesus Christ …  

Romans chapter 10, vs 9 - 10 + 13 

 … if you confess with your mouth that Jesus is Lord … and … believe … in your heart … that God raised Him from the dead … you will be saved … for … it is with your heart that you believe … and … are justified … … it is with your mouth that you confess … and … are saved … everyone who calls on the Name of the Lord will be saved …

John chapter 20, vs 31 

 … believe that Jesus Christ is the Christ … the Son of God … and … by believing … you will have life in His Name …