הַטּ֤וּ אָזְנְכֶם֙ וּלְכ֣וּ אֵלַ֔י שִׁמְע֖וּ וּתְחִ֣י נַפְשְׁכֶ֑ם וְאֶכְרְתָ֤ה לָכֶם֙ בְּרִ֣ית עוֹלָ֔ם חַֽסְדֵ֥י דָוִ֖ד הַנֶּאֱמָנִֽים׃
Incline your ear, and come unto Me; Hear, and your soul shall live; And I will make an everlasting covenant with you, Even the sure mercies of David.
Read kabbalistic (mystical) interpretation of Isaiah 55:3: and classical mystical sources.