Responsa do Psalmów 112:4
זָ֘רַ֤ח בַּחֹ֣שֶׁךְ א֭וֹר לַיְשָׁרִ֑ים חַנּ֖וּן וְרַח֣וּם וְצַדִּֽיק׃
Świecić będzie w ciemności światło zacnym, litościwemu, miłosiernemu i sprawiedliwemu.
Shut min haShamayim
They responded: "How quickly have you found your desire, my son," (Genesis 27:20) "Shining ['Zarach'] in the darkness is light for the upright ['Yesharim']." (Psalms 112:4) *Possibly, the meaning here is that R. Zerachia is in the darkness, while Rashi (the letters of his name are in the word Yesharim) is in the light and should be followed. Another possibility is that the first verse, spoken by the biblical Isaac, is a reference either to Rashi (R. Shlomo Yitzhaki) or to the Rif, R. Isaac Alfasi, who omits the statements of Rabbi Zeira in his Talmudic commentary. See Keset Hasofer ad loc. It is also unclear here to what extent the question here is theoretical. Maimonides omits the calendrical calculations as a commandment, while Sefer Mitzvot Gadol 47 seems to hold that it is a positive commandment incumbent upon every Jew who is able to make such calculations.
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