Isaiah 58:1-12, "
1 Cry aloud, spare not, lift up thy voice like a
trumpet, and shew my people their
transgression, and the house of Jacob their sins.
2 Yet they seek me daily, and delight to know my
ways, as a nation that did righteousness, and forsook
not the ordinance of their God: they ask of me the
ordinances of justice; they take delight in
approaching to God.
3 Wherefore have we fasted, say they, and thou
seest not?
wherefore have we afflicted our soul, and
thou takest no knowledge? Behold, in the day of
your fast ye find pleasure, and exact all your labours.
4 Behold,
ye fast for strife and debate,
and to smite
with the fist of wickedness:
ye shall not fast as ye do
this day, to make your voice to be heard on high.
(To make this point clear, God wasn't rebuking them for fasting in general, but for what reasons they were fasting for and also not doing, as the following verses explain. And in verse 4, He is telling them that they will not be heard because of their strife, debate, and smiting even.)
5 Is it such a fast that I have chosen?
a day for a man
to afflict his soul? is it to
bow down his head as a
bulrush, and to
spread sackcloth and ashes under
him? wilt thou call this a fast, and
an acceptable day
to the LORD?
6
Is not this the fast that I have chosen? to loose the
bands of wickedness, to undo the heavy burdens,
and to let the oppressed go free, and that ye break
every yoke?
(Here is the reason for a fast. And this is why a fast is so important.)
7 Is it not to
deal thy bread to the hungry, and that
thou
bring the poor that are cast out to thy house?
when thou seest the naked, that thou cover him; and
that thou hide not thyself from thine own flesh?
(And here are things we need to do in a proper fast: To help the poor and needy.)
8
Then shall thy light break forth as the morning,
and thine health shall spring forth speedily: and thy
righteousness shall go before thee; the glory of the
LORD shall be thy rereward.
(Our reward for doing a proper fast. I'm not trying to make this act seem mechanical, but to point out the steps God laid out for us to follow.)
9 Then shalt thou call, and the LORD shall answer;
thou shalt cry, and he shall say, Here I am. If thou
take away from the midst of thee the yoke, the
putting forth of the finger, and speaking vanity;
10 And if thou draw out thy soul to the hungry, and
satisfy the afflicted soul; then shall thy light rise in
obscurity, and thy darkness be as the noonday:
11 And the LORD shall guide thee continually, and
satisfy thy soul in drought, and make fat thy bones:
and thou shalt be like a watered garden, and like a
spring of water, whose waters fail not.
12 And they that shall be of thee shall build the old
waste places: thou shalt raise up the foundations of
many generations; and thou shalt be called, The
repairer of the breach, The restorer of paths to dwell
in.
(Verse 9-12 explains the blessings that come from doing a proper fast, but moreso helping and relieving the poor while in it.)