Jerusalem Talmud Shabbat 12:6

משנה: הַכּוֹתֵב שְׁתֵּי אוֹתִיּוֹת בִּשְׁנֵי הֶעְלֵימוֹת אֶחָד שַׁחֲרִית וְאֶחָד בֵּין הָעַרְבַּיִם רַבָּן גַּמְלִיאֵל מְחַייֵב וַחֲכָמִים פּוֹטְרִין: MISHNAH: One who wrote two letters in two periods of oblivion, one in the morning and one in the evening, Rabban Gamliel declares liable but the Sages declare not liable.

הלכה: ו׳. וְקַשְׁיָא עַל דְּרַבָּן גַּמְלִיאֵל. אִילּוּ קָצַר כִּגְרוֹגֶרֶת בְּשַׁחֲרִית וְכִגְרוֹגֶרֶת בֵּין הָעַרְבַּיִם בָּהֶעֱלֵם אֶחָד שֶׁמָּא אֵינוֹ חַייָב. כְּשֵׁם שֶׁאֵין הֶעֱלֵימוֹת חוֹלְקוֹת כָּךְ לֹא יְצָֽרְפוּ. רִבִּי מָנָא אָמַר לָהּ סְתָם. רִבִּי אָבוּן בְּשֵׁם רִבִּי יוֹחָנָן. טַעֲמֵיהּ דְּרַבָּן גַּמְלִיאֵל תַּמָּן. אֵין יְדִיעָה לַחֲצִי מְלָאכָה. וְדִכְווָתָה. אֵין זָדוֹן לַָחֲצִי זַיִת. אָכַל חֲצִי זַיִת בְּזָדוֹן וַחֲצִי זַיִת בִּשְׁגָגָה מְָהוּ שֶׁיִּצְטָרְפוּ. HALAKHAH: 6⁹⁵Here starts discussion of the last Mishnah.. It is difficult for Rabban Gamliel. If one harvested the volume of a dried fig in the morning and the volume of a dried fig in the evening in one oblivion, would he not be liable⁹⁶It is clear that there is only one liability created for each work category during one period of oblivion. It seems illogical that Rabban Gamliel should combine actions occurring in different periods of oblivion.? Since oblivions do not divide, so they should not combine! Rebbi Mana said it without attribution, Rebbi Abun in the name of Rebbi Joḥanan: The reason of Rabban Gamliel there is that there is no awareness for half a work⁹⁷Since in the interval between the two periods of oblivion there was no liability, this interval is disregarded., and similarly, there is no intent for half a work. If one ate half the volume of an olive intentionally and half the volume of an olive in error, would this combine⁹⁸If the question is not work on the Sabbath but eating forbidden food, would Rabban Gamliel combine intentional and unintentional acts? Since for the Sages they do not combine and practice does not follow Rabban Gamliel, no answer is given.?