'Fast' in the Bible

And the disciples of John and those of the Pharisees were fasting, and they come and say to him, 'Wherefore do the disciples of John and those of the Pharisees fast, and thy disciples do not fast?'

And Jesus said to them, 'Are the sons of the bride-chamber able, while the bridegroom is with them, to fast? so long time as they have the bridegroom with them they are not able to fast;

but days shall come when the bridegroom may be taken from them, and then they shall fast -- in those days.