'Have Faith' in the Bible

And, he, saith unto them - Because of your little faith. For, verily, I say unto you - If ye have faith as a grain of mustard seed, ye shall say to this mountain, remove hence yonder; and it shall be removed, and, nothing, shall be impossible to you.

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