'Fasting' in the Bible

And when ye fast, be not as the hypocrites, downcast in countenance; for they disfigure their faces, so that they may appear fasting to men: verily I say unto you, They have their reward.

But thou, when fasting, anoint thy head and wash thy face,

so that thou mayest not appear fasting unto men, but to thy Father who is in secret; and thy Father who sees in secret shall render it to thee.

But Jesus, having called his disciples to him, said, I have compassion on the crowd, because they have stayed with me already three days and they have not anything they can eat, and I would not send them away fasting lest they should faint on the way.

But this kind does not go out but by prayer and fasting.

And the disciples of John and the Pharisees were fasting; and they come and say to him, Why do the disciples of John and the disciples of the Pharisees fast, but thy disciples fast not?

and if I should dismiss them to their home fasting, they will faint on the way; for some of them are come from far.

And he said to them, This kind can go out by nothing but by prayer and fasting.

And Cornelius said, Four days ago I had been fasting unto this hour, and the ninth I was praying in my house, and lo, a man stood before me in bright clothing,

And as they were ministering to the Lord and fasting, the Holy Spirit said, Separate me now Barnabas and Saul for the work to which I have called them.