Core Text
Core Textאָמַר רַב הַמְנוּנָא: כָּל הַמִּתְפַּלֵּל בְּעֶרֶב שַׁבָּת וְאוֹמֵר וַיְכֻלּוּ, מַעֲלֶה עָלָיו הַכָּתוּב כְּאִלּוּ נַעֲשָׂה שֻׁתָּף לַהַקָּדוֹשׁ בָּרוּךְ הוּא בְּמַעֲשֵׂה בְרֵאשִׁית, שֶׁנֶּאֱמַר וַיְכֻלּוּ הַשָּׁמַיִם — תִּקְרֵי וַיְכָלּוּ אֶלָּא וַיְכֻלּוּ.
English of Core Text: Rav Hamnuna said: Anyone who prays on the eve of Shabbos and says “Vayechulu,” the verse accounts it for him as if he became a partner with the Holy One, blessed be He, in the work of creation, as it is said “Vayechulu ha-shamayim” — read not “vayechulu” (they were completed) but “vayechulu” (they completed).