אִם־אֶ֭שְׂמַח בְּפִ֣יד מְשַׂנְאִ֑י וְ֝הִתְעֹרַ֗רְתִּי כִּֽי־מְצָ֥אוֹ רָֽע׃
If I rejoiced at the destruction of him that hated me, Or exulted when evil found him—
Read kabbalistic (mystical) interpretation of Job 31:29: and classical mystical sources.