'Fasting' in the Bible

And on the twenty-fourth day of this month the children of Israel were assembled with fasting, and with sackclothes, and earth upon them.

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

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

And I wept, my soul was fasting: that also was to my reproach; --

My knees are failing through fasting, and my flesh hath lost its fatness;

Then the king went to his palace, and passed the night fasting; neither were concubines 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 to me with all your heart, and with fasting, and with weeping, and with mourning;