Isaiah 58:3-5

3“Why have we fasted, but you have not seen? We have denied ourselves, but you haven’t noticed!” “Look, you do as you please on the day of your fast, and oppress all your workers.

4You fast with contention and strife to strike viciously with your fist. You cannot fast as you do today, hoping to make your voice heard on high.

5Will the fast I choose be like this: A day for a person to deny himself, to bow his head like a reed, and to spread out sackcloth and ashes? Will you call this a fast and a day acceptable to the Lord?