'Fast' in the Bible

And they said to him, Why do the disciples of John fast often and make supplications, in like manner those also of the Pharisees, but thine eat and drink?

And he said to them, Can ye make the sons of the bridechamber fast when the bridegroom is with them?

But days will come when also the bridegroom will have been taken away from them; then shall they fast in those days.

I fast twice in the week, I tithe everything I gain.