'Fast' in the Bible

“Blessed (happy, fortunate) is the man who does this,And the son of man who takes hold of it,Who keeps the Sabbath without profaning it,And keeps his hand from doing any evil.”

“Also the foreigners who join themselves to the Lord,To minister to Him, and to love the name of the Lord,To be His servants, everyone who keeps the Sabbath without profaning itAnd holds fast to My covenant [by conscientious obedience];

‘Why have we fasted,’ they say, ‘and You do not see it?Why have we humbled ourselves and You do not notice?’Hear this [O Israel], on the day of your fast [when you should be grieving for your sins] you find something you desire [to do],And you force your hired servants to work [instead of stopping all work, as the law teaches].

“The facts are that you fast only for strife and brawling and to strike with the fist of wickedness.You do not fast as you do today to make your voice heard on high.

“Is a fast such as this what I have chosen, a day for a man to humble himself [with sorrow in his soul]?Is it only to bow down his head like a reedAnd to make sackcloth and ashes as a bed [pretending to have a repentant heart]?Do you call this a fast and a day pleasing to the Lord?

“[Rather] is this not the fast which I choose,To undo the bonds of wickedness,To tear to pieces the ropes of the yoke,To let the oppressed go freeAnd break apart every [enslaving] yoke?