'Have Faith' in the Bible

And Jesus said to them, Because of your unbelief. For truly I say to you, if ye have faith as a grain of a mustard plant, ye will say to this mountain, Remove from here to there, and it will depart, and nothing will be impossible t

And having answered, Jesus said to them, Truly I say to you, if ye have faith, and doubt not, ye will not only do that of the fig tree, but even if ye may say to this mountain, Be thou taken up and cast into the sea, it will happen

And having answered, Jesus says to them, Have faith in God.

And the Lord said, If ye have faith as a grain of mustard plant, ye would say to this sycamine tree, Be thou uprooted and be planted in the sea, and it would have obeyed you.

What is the benefit, my brothers, if some man should say to have faith, but has no works? Can the faith save him?

But some man will say, Thou have faith, and I have works. Show me thy faith from thy works, and I will show thee from my works my faith.