'Fast' in the Bible

Then they told him, "John's disciples frequently fast and pray, and so do those of the Pharisees. But your disciples keep right on eating and drinking."

But Jesus told them, "You can't force the wedding guests to fast while the groom is still with them, can you?

But the time will come when the groom will be taken away from them, and at that time they will fast."

I fast twice a week, and I give a tenth of my entire income.'