Jesaja 58:6

As the last prophecy of the second book contained all the three elements of prophetic addresses - reproach, threat, and promise - so this, the first prophecy of the third book, cannot open in any other way than with a rehearsal of one of these. The prophet receives the commission to appear as the preacher of condemnation; and whilst Jehovah is giving the reason for this commission, the preaching itself commences. "Cry with full throat, hold not back; lift up thy voice like a bugle, and proclaim to my people their apostasy, and to the house of Jacob their sins. And they seek me day by day, and desire to learn my ways, like a nation which has done righteousness, and has not forsaken the right of their God: they ask of me judgments of righteousness; they desire the drawing near of Elohim." As the second prophecy of the first part takes as its basis a text from Micah (Mic 2:1-4), so have we here in Isa 58:1 the echo of Mic 3:8. Not only with lisping lips (Sa1 1:13), but with the throat (Psa 115:7; Psa 149:6); that is to say, with all the strength of the voice, lifting up the voice like the shōphâr (not a trumpet, which is called חצצרה, nor in fact any metallic instrument, but a bugle or signal horn, like that blown on new year's day: see at Psa 81:4), i.e., in a shrill shouting tone. With a loud voice that must be heard, with the most unsparing publicity, the prophet is to point out to the people their deep moral wounds, which they may indeed hide from themselves with hypocritical opus operatum, but cannot conceal from the all-seeing God. The ו of ואותי does not stand for an explanatory particle, but for an adversative one: "their apostasy ... their sins; and yet (although they are to be punished for these) they approach Jehovah every day" (יום יום with mahpach under the…

58:6-7 True fasting creates an awareness of injustice and oppression and prompts the practitioner to reach out to help the needy in their struggles (see 42:7; Matt 25:35-36; Jas 1:27).