3 "Why do we fast, but you do not see? Why humble ourselves, but you do not notice?" Look, you serve your own interest on your fast day, and oppress all your workers. 4 Look, you fast only to quarrel and to fight and to strike with a wicked fist. Such fasting as you do today will not make your voice heard on high. 5 Is such the fast that I choose, a day to humble oneself? Is it to bow down the head like a bulrush, and to lie in sackcloth and ashes? Will you call this a fast, a day acceptable to the Lord?
Matthew Henry's Commentary on Isaiah 58:3-5
Commentary on Isaiah 58:3-12
(Read Isaiah 58:3-12)
A fast is a day to afflict the soul; if it does not express true sorrow for sin, and does not promote the putting away of sin, it is not a fast. These professors had shown sorrow on stated or occasioned fasts. But they indulged pride, covetousness, and malignant passions. To be liberal and merciful is more acceptable to God than mere fasting, which, without them, is vain and hypocritical. Many who seem humble in God's house, are hard at home, and harass their families. But no man's faith justifies, which does not work by love. Yet persons, families, neighbourhoods, churches, or nations, show repentance and sorrow for sin, by keeping a fast sincerely, and, from right motives, repenting, and doing good works. The heavy yoke of sin and oppression must be removed. As sin and sorrow dry the bones and weaken the strongest human constitution; so the duties of kindness and charity strengthen and refresh both body and mind. Those who do justly and love mercy, shall have the comfort, even in this world. Good works will bring the blessing of God, provided they are done from love to God and man, and wrought in the soul by the Holy Spirit.