Thus speaketh the LORD of hosts, saying, {k} Execute true judgment, and show mercy and compassions every man to his brother:

(k) He shows that they did not fast with a sincere heart, but because of hypocrisy, and that it was not done from a pure religion, because they lacked these offices of charity which should have declared that they were godly; Mt 23:23.

Wesley's Notes

7:9 Spake - To your fathers.

King James Translators' Notes

Execute...: Heb. Judge judgment of truth

Jamieson-Fausset-Brown Bible Commentary

9. speaketh-implying that these precepts addressed to their ancestors were the requirements of Jehovah not merely then, but now. We must not only not hurt, but we must help our fellow men. God is pleased with such loving obedience, rather than with empty ceremonies.

Matthew Henry's Concise Commentary

7:8-14 God's judgements upon Israel of old for their sins, were written to warn Christians. The duties required are, not keeping fasts and offering sacrifices, but doing justly and loving mercy, which tend to the public welfare and peace. The law of God lays restraint upon the heart. But they filled their minds with prejudices against the word of God. Nothing is harder than the heart of a presumptuous sinner. See the fatal consequences of this to their fathers. Great sins against the Lord of hosts, bring great wrath from his power, which cannot be resisted. Sin, if regarded in the heart, will certainly spoil the success of prayer. The Lord always hears the cry of the broken-hearted penitent; yet all who die impenitent and unbelieving, will find no remedy or refuge from miseries which while here they despised and defied, but which they then will not be able to bear.