וְיָדַ֣עְתִּי אֱלֹהַ֔י כִּ֤י אַתָּה֙ בֹּחֵ֣ן לֵבָ֔ב וּמֵישָׁרִ֖ים תִּרְצֶ֑ה אֲנִ֗י בְּיֹ֤שֶׁר לְבָבִי֙ הִתְנַדַּ֣בְתִּי כָל־אֵ֔לֶּה וְעַתָּ֗ה עַמְּךָ֙ הַנִּמְצְאוּ־פֹ֔ה רָאִ֥יתִי בְשִׂמְחָ֖ה לְהִֽתְנַדֶּב־לָֽךְ׃
我的上帝啊，我知道你察驗人心，喜悅正直。我以正直的心甘心樂意獻上這一切；現在我看見你在這裡的百姓都歡歡喜喜地甘心向你奉獻。
Sha'arei Teshuvah
Secondly - because on other holidays, we establish a meal for the joy of the commandment. For the reward for joy over the commandment increases and grows, as it is stated (I Chronicles 29:17), “now Your people, who are present here - I saw them joyously making freewill offerings.” And it is stated (Deuteronomy 28:47), “Because you would not serve the Lord your God in joy and gladness.” But since the fast is on Yom Kippur, they were obligated to fix the meal over the joy of the commandment, on the eve of Yom Kippur.