'Fasting' in the Bible

Now in the twenty and fourth day of this month the children of Israel were assembled with fasting, and with sackcloth, and earth upon them.

And in every province, whithersoever the king's commandment and his decree came, there was great mourning among the Jews, and fasting, and weeping, and wailing; and many lay in sackcloth and ashes.

But as for me, when they were sick, my clothing was sackcloth: I afflicted my soul with fasting; And my prayer returned into mine own bosom.

When I wept, and chastened my soul with fasting, That was to my reproach.

My knees are weak through fasting; And my flesh faileth of fatness.

Then the king went to his palace, and passed the night fasting; neither were instruments of music brought before him: and his sleep fled from him.

And I set my face unto the Lord God, to seek by prayer and supplications, with fasting and sackcloth and ashes.

Yet even now, saith Jehovah, turn ye unto me with all your heart, and with fasting, and with weeping, and with mourning: