"And they overcame him by the blood of the Lamb, and by the word of their testimony" -Rev 12:11

He replied, “Because you have so little faith. Truly I tell you, if you have faith as small as a mustard seed, you can say to this mountain, ‘Move from here to there,’ and it will move. Nothing will be impossible for you.”  Matthew 12:20

Jesus replied, “Truly I tell you, if you have faith and do not doubt, not only can you do what was done to the fig tree, but also you can say to this mountain, ‘Go, throw yourself into the sea,’ and it will be done.  Matthew 21:21

Then Jesus said to her, “Woman, you have great faith! Your request is granted.” And her daughter was healed at that moment.  Matthew 15:28

Now faith is confidence in what we hope for and assurance about what we do not see. ...And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and that he rewards those who earnestly seek him.  Hebrews 11:1 & 6

Through him you believe in God, who raised him from the dead and glorified him, and so your faith and hope are in God.  I Peter 1:21

These have come so that the proven genuineness of your faith—of greater worth than gold, which perishes even though refined by fire—may result in praise, glory and honor when Jesus Christ is revealed.  I Peter 1:7