Related for Nehemiah 8:10
וַיֹּ֣אמֶר לָהֶ֡ם לְכוּ֩ אִכְל֨וּ מַשְׁמַנִּ֜ים וּשְׁת֣וּ מַֽמְתַקִּ֗ים וְשִׁלְח֤וּ מָנוֹת֙ לְאֵ֣ין נָכ֣וֹן ל֔וֹ כִּֽי־קָד֥וֹשׁ הַיּ֖וֹם לַאֲדֹנֵ֑ינוּ וְאַל־תֵּ֣עָצֵ֔בוּ כִּֽי־חֶדְוַ֥ת יְהוָ֖ה הִ֥יא מָֽעֻזְּכֶֽם׃
Then he said unto them: ‘Go your way, eat the fat, and drink the sweet, and send portions unto him for whom nothing is prepared; for this day is holy unto our Lord; neither be ye grieved; for the joy of the LORD is your strength.’
Shulchan Arukh, Orach Chayim
1. If it is permitted to fast on Rosh HaShana, and in it is 3 paragraphs. One eats, drinks and is merry [on Rosh Hashanah.] We do not fast, whether on Rosh Hashanah, nor on Shabbos Shuva (the Shabbos of Repentance which is between R'H and Yom Kippur). However, people should not eat to complete satiation, so that they do not reach light-headedness, and that the fear of God should remain on them.
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