'Have Faith' in the Bible

And he said to them, "Because of your little faith. For truly I say to you, if you have faith like a mustard seed, you will say to this mountain, 'Move from here [to] there,' and it will move, and nothing will be impossible for you."

And Jesus answered [and] said to them, "Truly I say to you, if you have faith and do not doubt, you will do not only [what was done to] the fig tree, but even if you say to this mountain, 'Be lifted up and thrown into the sea," it will happen!