'Have Faith' in the Bible

And He saith to them, "Because of your little faith. For verily I say to you, if ye have faith as a grain of mustard seed, ye shall say to this mountain, 'Remove hence yonder,' and it will be removed, and nothing shall be impossible to you."

And Jesus, answering, said to them, "Verily I say to you, if ye have faith, and do not doubt, not only the withering of the fig tree shall ye accomplish, but, even if ye say to this mountain, 'Be lifted up, and be cast into the sea,' it shall be done.