'Fast' in the Bible

Then they said to him, "John's disciples frequently fast and pray, and so do the disciples of the Pharisees, but yours continue to eat and drink."

So Jesus said to them, "You cannot make the wedding guests fast while the bridegroom is with them, can you?

But those days are coming, and when the bridegroom is taken from them, at that time they will fast."

I fast twice a week; I give a tenth of everything I get.'