Kabbalah к Мелахим А 22:37

16. Scripture states: "All the hosts of heaven stand by Him to His right and to His left." The sages asked, "And are there right and left above? Rather, the right for virtue and the left for guilt." Therefore, a sefirah which influences Kindness to the worthy is allegorically considered "right" and one which influences Judgment upon the guilty is allegorically considered "left".