Isaiah 58:2-5

2Yet they seek me daily, and delight to know my ways, as a nation that doeth righteousness, and hath not forsaken the ordinance of their 1God; they ask of me the ordinances of righteousness, they take delight in approaching to 2God:

3— Wherefore have we fasted, and thou seest not; have afflicted our soul, and thou takest no knowledge? Behold, in the day of your fast ye find what pleaseth [you], and exact all your labours.

4Behold, ye have fasted for strife and debate, and to smite with the fist of wickedness; ye do not at present fast, to cause your voice to be heard on high.

5Is such the fast that I have chosen, a day for a man to afflict his soul, — that he should bow down his head as a bulrush, and spread sackcloth and ashes [under him]? Wilt thou call this a fast, and a day acceptable to Jehovah?