'Fast' in the Bible

They said to him, "Why do John's disciples often fast and pray, likewise also the disciples of the Pharisees, but yours eat and drink?"

He said to them, "Can you make the friends of the bridegroom fast, while the bridegroom is with them?

But the days will come when the bridegroom will be taken away from them. Then they will fast in those days."

I fast twice a week. I give tithes of all that I get.'