וַיֵּלְכ֨וּ כָל־הָעָ֜ם לֶאֱכֹ֤ל וְלִשְׁתּוֹת֙ וּלְשַׁלַּ֣ח מָנ֔וֹת וְלַעֲשׂ֖וֹת שִׂמְחָ֣ה גְדוֹלָ֑ה כִּ֤י הֵבִ֙ינוּ֙ בַּדְּבָרִ֔ים אֲשֶׁ֥ר הוֹדִ֖יעוּ לָהֶֽם׃ (ס)
And all the people went their way to eat, and to drink, and to send portions, and to make great mirth, because they had understood the words that were declared unto them.
Read kabbalistic (mystical) interpretation of Nehemiah 8:12: and classical mystical sources.