His face was blackened like the rims of a pot/ to be disgraced/ his face was as black as a pot
By metaphor: deeply insulted by harsh rebukes cast upon him. His face was blackened (the rims of the pot signify the edges removed after being heated by coals).
("And there are those who say that he went out against his face, and eighty pairs of wise disciples, clothed in golden garments, whose faces were black as the rims of a pot, who were told to write on the horn of an ox, 'You have no share in the God of Israel'" - Jerusalem Haggai 2:1, and so on: "And even so they also were afflicted, and their faces, they say, were blackened "Like the rim of a pot" - Peace be upon you/ The company, Ket)
Translation
Expression (Hebrew)
הִשְׁחִירוּ פָּנָיו כְּשׁוּלֵי הַקְּדֵירָה
Definition (Hebrew)
בְּהַשְׁאָלָה: נֶעֱלַב קָשׁוֹת מֵעֶלְבּוֹנוֹת קָשִׁים שֶׁהוּטְחוּ בּוֹ. פָּנָיו הַלּוֹבְנוֹ (שׁוּלֵי הַקְּדֵרָה מַשְׁמָע הַשּׁוּלַיִם שֶׁל הֵסִיר לְאַחַר שֶׁחֻמְּמוּ עַל יְדֵי גֶּחָלִים).
("וְיֵשׁ אוֹמְרִים כְּנֶגֶד פָּנָיו יָצָא הוּא וּשְׁמוֹנִים זוּג שֶׁל תַּלְמִידֵי חֲכָמִים מְלֻבָּשִׁין תִּירְקִי זָהָב שֶׁהִשְׁחִירוּ פְּנֵיהֶן כְּשׁוּלֵי קְדֵרָה שֶׁאָמְרוּ לָהֶן כָּתְבוּ עַל קֶרֶן שׁוֹר שֶׁאֵין לָכֶם חֵלֶק בֵּאלֹהֵי יִשְׂרָאֵל"- יְרוּשַׁלְמִי חֲגִיגָה ב, א, וְכֵן:"וְאַף עַל פִּי כֵן הִתְעַנּוּ גַּם הֵם וּפְנֵיהֶם,הֵם אוֹמְרִים,הִשְׁחִירוּ כְּשׁוּלֵי קְדֵרָה"- שָׁלוֹם עֲלֵיכֶם/ הַחֲבוּרָה, קעט)