וּבַחֲמִשָּׁ֨ה עָשָׂ֥ר י֛וֹם לַחֹ֥דֶשׁ הַזֶּ֖ה חָ֑ג שִׁבְעַ֣ת יָמִ֔ים מַצּ֖וֹת יֵאָכֵֽל׃
Pada hari kelima belas bulan itu adalah hari raya; selama tujuh hari roti tidak beragi harus dimakan.
Or HaChaim
לחדש הזה, of this month, etc. The word "this" appears superfluous. Torat Kohanim Leviticus 23,6 explains that the word is used to teach us that on the Sukkot festival one need not eat matzah. Matzah needs to be eaten only on Passover. I have already explained this on Leviticus 14,7.