'Fast' in the Bible

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

And he said unto them, 'Are ye able to make the sons of the bride-chamber -- in the bridegroom being with them -- to fast?

but days will come, and, when the bridegroom may be taken away from them, then they shall fast in those days.'

I fast twice in the week, I give tithes of all things -- as many as I possess.