'Have Faith' in the Bible

Jesus answered and said to them, I tell you truly, that if you have faith and doubt not, you shall not only do this of the fig tree, but if you should say to this mountain, Be taken up and be cast into the sea, it would be done;

And Jesus answered and said to them, Have faith in God;

You have faith; have it for yourself before God, Blessed is he that condemns not himself in what he approves;

But some one will say, You have faith, and I have works; show me your faith without works, and I will show you my faith by works.