What good is it, my brothers and sisters, if you say you have faith but do not have works? Can faith save you?  If a brother or sister is naked and lacks daily food, and one of you says to them, ‘Go in peace; keep warm and eat your fill’, and yet you do not supply their bodily needs, what is the good of that? So faith by itself, if it has no works, is dead.

James 2: 14-17 New International Version

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 17:20 New International Version