'Have Faith' in the Bible

And Jesus said to them, For your unbelief: for truly I say to you, If ye have faith as a kernel of mustard, ye shall say to this mount, Go away from thence, and it shall go away; and nothing shall be impossible to you.

And Jesus, having answered, said to them, Truly I say to you, if ye have faith, and be not removed, ye shall do not only that of the fig tree, but also to this mountain, if ye should say, Be thou lifted up, and cast into the sea, it shall be.