Talmud for Chullin 5:5

יוֹם אֶחָד הָאָמוּר בְּאוֹתוֹ וְאֶת בְּנוֹ, הַיּוֹם הוֹלֵךְ אַחַר הַלָּיְלָה. אֶת זוֹ דָרַשׁ שִׁמְעוֹן בֶּן זוֹמָא. נֶאֱמַר בְּמַעֲשֵׂה בְרֵאשִׁית (בראשית א), יוֹם אֶחָד, וְנֶאֱמַר בְּאוֹתוֹ וְאֶת בְּנוֹ (ויקרא כב), יוֹם אֶחָד. מַה יּוֹם אֶחָד הָאָמוּר בְּמַעֲשֵׂה בְרֵאשִׁית הַיּוֹם הוֹלֵךְ אַחַר הַלַּיְלָה, אַף יוֹם אֶחָד הָאָמוּר בְּאוֹתוֹ וְאֶת בְּנוֹ, הַיוֹם הוֹלֵךְ אַחַר הַלָּיְלָה:

The expression of the law, "One day," when treating of the prohibition of slaughtering an animal and its young in one [and the same] day, is to be understood, that the day and the night which preceded it are to be reckoned together [as forming one day]. For thus was it expounded by R. Shimon ben Zomah, "The term (Genesis 1:5, Leviticus 22:28) 'one day' is used in the Creation story and also in the prohibition of slaughtering an animal and its young, to teach us, that just as in Creation the day followed night, thus also must it be understood in this case."

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