Most Relevant Verses
Why have we fasted, they say, and You do not see it? Why have we afflicted ourselves, and You take no knowledge [of it]? Behold [O Israel], on the day of your fast [when you should be grieving for your sins], you find profit in your business, and [instead of stopping all work, as the law implies you and your workmen should do] you extort from your hired servants a full amount of labor.
Though they fast, I will not hear their cry; and though they offer burnt offering and cereal offering [without heartfelt surrender to Me, or by offering it too late], I will not accept them. But I will consume them by the sword, by famine, and by pestilence.