א רִבִּי יוֹסֶי בַּר בּוּן בָּעֵי אִין תֵּימַר שְׁנַיִם סָפֵק. רָאָה שְׁנֵי כּוֹכָבִים בְּעֶרֶב שַׁבָּת וְהִתְרוּ בוֹ וְעָשָׂה מְלָאכָה. רָאָה שְׁנֵי כּוֹכָבִים בְּמוֹצָאֵי שַׁבָּת וְהִתְרוּ בוֹ וְעָשָׂה מְלָאכָה. מַה נַפְשֵׁךְ אִם הָרִאשׁוֹנִים יוֹם הֵן אַף הָאַחֲרוֹנִים יוֹם הֵן וִיהֵא חַיָיב עַל הָאַחֲרוֹנים. אִם הָאַחֲרוֹנִים לַיְלָה אַף הָרִאשׁוֹנִים לַיְלָה וִיהֵא חַיָיב עַל הָרִאשׁוֹנִים. רָאָה שְׁנֵי כּוֹכָבִים בְּעֶרֶב שַׁבָּת וְקָצַר כַּחֲצִי גְּרוֹגֶרֶת. בְּשַׁחֲרִית וְקָצַר כַּחֲצִי גְּרוֹגֶרֶת. רָאָה שְׁנֵי כּוֹכָבִים בְּמוֹצָאֵי שַׁבָּת וְקָצַר כַּחֲצִי גְּרוֹגֶרֶת. מַה נַפְשֵׁךְ אִם הָרִאשׁוֹנִים יוֹם הֵן אַף הָאַחֲרוֹנִים יוֹם הֵן וְיִצְטָרֵף שֶׁל שַׁחֲרִית עִם שֶׁל מוֹצָאֵי שַׁבָּת וִיהֵא חַיָיב עַל הָאַחֲרוֹנִים. אִם הָאַחֲרוֹנִים לַיְלָה אַף הָרִאשׁוֹנִים לַיְלָה וְיִצְטָרֵף שֶׁל שַׁחֲרִית עִם שֶׁל לֵילֵי שַׁבָּת וִיהֵא חַיָיב עַל הָרִאשׁוֹנִים.
1 Rebbi Yose bar Abun investigated: If you say that two (stars) present a doubt, if someone saw two stars on Friday night, was warned, and did forbidden work, he also saw two stars on Saturday night, was warned, and did forbidden work, then it is logical to assert that if the first period was daytime the last period was also daytime and he would be guilty for the later work; if the last period was nighttime then the first period was also nighttime and he would be guilty for the first work. If someone saw two stars on Friday night and harvested about (the volume of) half a fig, in the morning he harvested about half a fig, and he saw two stars on Saturday night and harvested about half a fig, then it is logical to assert that if the first period was daytime the last period was also daytime and one would combine daytime with Saturday night and he would be guilty for his last work; if the last period was nighttime then the first period was also nighttime and one would combine daytime with Friday night and he would be guilty for his first work.