'Fast' in the Bible

John's disciples and the Pharisees were fasting, and they came and asked him, "Why do John's disciples and the disciples of the Pharisees fast, but your disciples don't fast?"

Jesus said to them, "Can the groomsmen fast while the bridegroom is with them? As long as they have the bridegroom with them, they can't fast.

But the days will come when the bridegroom will be taken away from them, and then will they fast in that day.