Cry aloud, so the Lord calls out to the prophet in bidding him rebuke the hypocritical conduct of the people, spare not, in an indulgence which in this case would amount to a sinful weakness, for which reason a crying at the top of the voice is demanded, lift up thy voice like a trumpet, with the far-sounding signal of the trumpets used on the great festivals of the Jewish Church, and show My people their transgression, the breach of covenant of which they had become guilty, and the house of Jacob their sins, for the Lord's mercy had chosen the entire nation and He still sought all its members with the same fervent love which He had shown them of old.
Related Commentaries of Isaiah 58:1
Isaiah 58:1
1 Cry aloud,a spare not, lift up thy voice like a trumpet, and shew my people their transgression, and the house of Jacob their sins.