“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?/ 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?(vv.6-7)
Here the conventional meaning of fasting is replaced by meaning that God desires from those who love him. It is not the fast or going without food when luxury allows you to splurge on whatever you have yen for, It is self worship meaning that you take pleasure in the manner you subject your body to pain. But feeding those who are forced to starve from necessity makes you connected in a meaningful way :’ You identify with your own flesh and not hide from them in distress. ‘ Activism for those who are unfortunate has never gone out of fashion,- and charity is a Christian virtue. In any society however affluent there shall be some 15 percent who are very likely to go under. When society of men throws some under the bus, you are willing to stand effectively in the breach for their sake. You are not grandstanding but for the Lord. It is what charity means. You love your brethren for no other reason that you could suffer some hurt if it comes to it so one who is in his dire straits is led to safety. Instead what spirit of anti-christ teaches present day Evangelicals is to make common cause with politicians who are working against the clock to pull the wool over the electorate with alternate truths.
So fasting in the sense Prophet Isaiah means is to give yourselves in a practical manner to the Lord. Like the five loaves and two small fishes the act shall never be forgotten. How God rewards those who fast or observe Sabbath in the right spirit is mentioned in the next verse: “ 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 reward(v.8)”. This is the everlasting light dawning on them to guide them on their way about as v.11 describes,” 1, And the Lord shall guide thee continually, 2. and satisfy thy soul in drought, 3. and make fat thy bones: and thou shalt be like a watered garden, and like a spring of water, whose waters fail not.” Entering into his rest is an experience while we are in our bodies as well as being a continual source,- a spring of water satisfying the needs of others. Death shall not change the essentials. As spiritual bodies in eternity we are part of the glory of God as everlasting light.
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 noon day:
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.
13 If thou turn away thy foot from the sabbath, from doing thy pleasure on my holy day; and call the sabbath a delight, the holy of the Lord, honourable; and shalt honour him, not doing thine own ways, nor finding thine own pleasure, nor speaking thine own words:
14 Then shalt thou delight thyself in the Lord; and I will cause thee to ride upon the high places of the earth, and feed thee with the heritage of Jacob thy father: for the mouth of the Lord hath spoken it.