'Have Faith' in the Bible

And he says to them, Because of your little faith: for truly I say to you, If you have faith as a grain of mustard seed, you will say to this mountain, Be moved from this place to that; and it will be moved; and nothing will be impossible to you.

But whoever is a cause of trouble to one of these little ones who have faith in me, it would be better for him to have a great stone fixed to his neck, and to come to his end in the deep sea.

And Jesus in answer said to them, Truly I say to you, If you have faith, without doubting, not only may you do what has been done to the fig-tree, but even if you say to this mountain, Be taken up and put into the sea, it will be done.

The baptism of John, where did it come from? from heaven or from men? And they were reasoning among themselves, saying, If we say, From heaven; he will say to us, Why then did you not have faith in him?

For John came to you in the way of righteousness, and you had no faith in him, but the tax-farmers and the loose women had faith in him: and you, when you saw it, did not even have regret for your sins, so as to have faith in him.

A saviour of others, he has no salvation for himself. If he is the King of Israel, let him now come down from the cross, and we will have faith in him.