Malachi 3:2 Kabbalah

וּמִ֤י מְכַלְכֵּל֙ אֶת־י֣וֹם בּוֹא֔וֹ וּמִ֥י הָעֹמֵ֖ד בְּהֵרָֽאוֹת֑וֹ כִּֽי־הוּא֙ כְּאֵ֣שׁ מְצָרֵ֔ף וּכְבֹרִ֖ית מְכַבְּסִֽים׃

But who may abide the day of his coming? And who shall stand when he appeareth? For he is like a refiner’s fire, and like fullers’soap;