לָכֵ֤ן ׀ שָׁמַ֥ע יְהוָ֗ה וַֽיִּתְעַבָּ֥ר וְ֭אֵשׁ נִשְּׂקָ֣ה בְיַעֲקֹ֑ב וְגַם־אַ֝֗ף עָלָ֥ה בְיִשְׂרָאֵֽל׃
Therefore the LORD heard, and was wroth; And a fire was kindled against Jacob, And anger also went up against Israel;
Read kabbalistic (mystical) interpretation of Psalms 78:21: and classical mystical sources.