Is such the fast that I choose, a day for a person to humble himself? Is it to bow down his head like a reed, and to spread sackcloth and ashes under him? Will you call this a fast, and a day acceptable to the LORD?
Here we have, I. The displeasure which these hypocrites conceived against God for not accepting the services which they themselves had a mighty opinion of (Isa 58:3): Wherefore have we fasted, say they, and thou seest not? Thus they went in the way of Cain, who was angry at God, and resented it as a gross affront that his offering was not accepted.
Commenting on Isaiah 58:3-7
Is it such a fast that I have chosen?.... That is, can this be thought to be a fast approved of by me, and acceptable to me, before described, and is as follows: a day for a man to afflict his soul?
for a man to afflict his soul--The pain felt by abstinence is not the end to be sought, as if it were meritorious; it is of value only in so far as it leads us to amend our ways (Isa 58:6-7). bow . . . head . . . sackcloth--to affect the outward tokens, so as to "appear to men to fast" (Mat 6:17-18; Kg1 21:27; Est 4:3).