וַעֲשִׂיתֶ֖ם כַּאֲשֶׁ֣ר עָשִׂ֑יתִי עַל־שָׂפָם֙ לֹ֣א תַעְט֔וּ וְלֶ֥חֶם אֲנָשִׁ֖ים לֹ֥א תֹאכֵֽלוּ׃
And ye shall do as I have done: ye shall not cover your upper lips, nor eat the bread of men;
Read Jewish philosophical commentary on Ezekiel 24:22: and classical philosophical sources.