Isaiah 6:6 Kabbalah

וַיָּ֣עָף אֵלַ֗י אֶחָד֙ מִן־הַשְּׂרָפִ֔ים וּבְיָד֖וֹ רִצְפָּ֑ה בְּמֶ֨לְקַחַ֔יִם לָקַ֖ח מֵעַ֥ל הַמִּזְבֵּֽחַ׃

Then flew unto me one of the seraphim, with a glowing stone in his hand, which he had taken with the tongs from off the altar;