Isaiah 58:3

Wherefore have we fasted, say they, in the spirit of self-righteousness, which caused them to act as though God had been placed under obligations by their fasting, and Thou seest not? the Lord ignoring them on account of their hypocrisy. Wherefore have we afflicted our soul, by the hardships of fasting, and Thou takest no knowledge? the intimation being that Jehovah was not appreciating their efforts sufficiently. But the Lord has His answer ready and sets them right with emphasis. Behold, in the day of your fast ye find pleasure, seeking advantage for themselves by their show of piety, and exact all your labors, oppressing the men who worked for them even while they were professing an unusual degree of holiness.