הַ֥לְלוּ יָ֨הּ ׀ שִׁ֣ירוּ לַֽ֭יהוָה שִׁ֣יר חָדָ֑שׁ תְּ֝הִלָּת֗וֹ בִּקְהַ֥ל חֲסִידִֽים׃
Hallelujah. Sing unto the LORD a new song, And His praise in the assembly of the saints.
Read kabbalistic (mystical) interpretation of Psalms 149:1: and classical mystical sources.