He must not, they must not
He is forbidden. It is not proper that...
("Or at least that it is found in the early authorities, we must not simply say that they decreed also in the case of neglecting a mitzvah" - Responsa Shevet HaLevi, part 5, section 44, and also: "Your foundation is in the holy mountains", he placed his hand on my shoulder and said that I must not forget that my great-grandfather is the one who went searching for time in the mountains" - Haim Be'er / Feathers, 119)
Translation
Expression (Hebrew)
אַל לוֹ, אַל לָהֶם
Definition (Hebrew)
אָסוּר לוֹ. אֵין זֶה רָאוּי שֶׁ...
("אוֹ עכ"פ שֶׁנִּמְצָא כֵּן בָּרִאשׁוֹנִים, אַל לָנוּ מִסְתַּמָּא לוֹמַר דְּגָזְרוּ גַּם בְּמָקוֹם בִּטּוּל מִצְוָה"- שו"ת שֵׁבֶט הַלֵּוִי חֵלֶק ה סִימָן מ"ד, וְכֵן:"יְסוֹדְךָ בְּהַרְרֵי קֹדֶשׁ", הִנִּיחַ יָדוֹ עַל כַּתְפִּי וְאָמַר כִּי אַל לִי לִשְׁכֹּחַ שֶׁאָבִי סַבִּי הוּא שֶׁיָּצָא לַחֲפֹּשׂ אֶת הַזְּמַן בָּהָרִים"- חַיִּים בְּאָר/ נוֹצוֹת, 119)