Reference for Eruvin 8:1

כֵּיצַד מִשְׁתַּתְּפִין בַּתְּחוּמִין. מֵנִיחַ אֶת הֶחָבִית וְאוֹמֵר, הֲרֵי זֶה לְכָל בְּנֵי עִירִי, לְכָל מִי שֶׁיֵּלֵךְ לְבֵית הָאֵבֶל אוֹ לְבֵית הַמִּשְׁתֶּה. וְכֹל שֶׁקִּבֵּל עָלָיו מִבְּעוֹד יוֹם, מֻתָּר. מִשֶּׁתֶּחְשַׁךְ, אָסוּר, שֶׁאֵין מְעָרְבִין מִשֶּׁתֶּחְשָׁךְ:

How is a tchum (Sabbath bound) partnership made? He puts down the (food) jug and says: "This is for all the men of my city, for whoever goes to the house of the mourner or the house of the (wedding) feast [i.e., for mitzvah purposes, the ruling being: Eruvei tchumin are made only for mitzvah purposes.] And all who took it upon themselves [to rely upon this eruv] while it was still day are permitted to do so. And after dark (i.e., on Shabbath), it is forbidden, an eruv not being made after dark. [This, when they did not apprise him (of the eruv) while it was still day; but if they did, even if he took it upon himself to rely upon this eruv of a certainty only after it had gotten dark, it is permitted.]

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