'Fasting' in the Bible

'And when ye may fast, be ye not as the hypocrites, of sour countenances, for they disfigure their faces, that they may appear to men fasting; verily I say to you, that they have their reward.

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

that thou mayest not appear to men fasting, but to thy Father who is in secret, and thy Father, who is seeing in secret, shall reward thee manifestly.

And Jesus having called near his disciples, said, 'I have compassion upon the multitude, because now three days they continue with me, and they have not what they may eat; and to let them away fasting I will not, lest they faint in the way.'

and this kind doth not go forth except in prayer and fasting.'