קְרָ֤א בְגָרוֹן֙ אַל־תַּחְשֹׂ֔ךְ כַּשּׁוֹפָ֖ר הָרֵ֣ם קוֹלֶ֑ךָ וְהַגֵּ֤ד לְעַמִּי֙ פִּשְׁעָ֔ם וּלְבֵ֥ית יַעֲקֹ֖ב חַטֹּאתָֽם׃
Cry aloud, spare not, Lift up they voice like a horn, And declare unto My people their transgression, And to the house of Jacob their sins.
Read kabbalistic (mystical) interpretation of Isaiah 58:1: and classical mystical sources.