וְיָדַ֣עְתִּי אֱלֹהַ֔י כִּ֤י אַתָּה֙ בֹּחֵ֣ן לֵבָ֔ב וּמֵישָׁרִ֖ים תִּרְצֶ֑ה אֲנִ֗י בְּיֹ֤שֶׁר לְבָבִי֙ הִתְנַדַּ֣בְתִּי כָל־אֵ֔לֶּה וְעַתָּ֗ה עַמְּךָ֙ הַנִּמְצְאוּ־פֹ֔ה רָאִ֥יתִי בְשִׂמְחָ֖ה לְהִֽתְנַדֶּב־לָֽךְ׃
나의 하나님이여 주께서 마음을 감찰하시고 정직을 기뻐하시는 줄 내가 아나이다 내가 정직한 마음으로 이 모든 것을 즐거이 드렸사오며 이제 내가 또 여기 있는 주의 백성이 주께 즐거이 드리는 것을 보오니 심히 기쁘도소이다
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.