'Fasting' in the Bible

Now John’s disciples and the Pharisees were fasting. People came and asked Him, “Why do John’s disciples and the Pharisees’ disciples fast, but Your disciples do not fast?”

"Can a wedding party fast while the bridegroom is among them?" replied Jesus. "So long as they have the bridegroom with them, fasting is impossible.

And if I send them away fasting to their own houses, they will faint by the way: for divers of them came from far.

And he said unto them, This kind can come forth by nothing, but by prayer and fasting.