אִם־בְּחֻקֹּתַ֖י תֵּלֵ֑כוּ וְאֶת־מִצְוֺתַ֣י תִּשְׁמְר֔וּ וַעֲשִׂיתֶ֖ם אֹתָֽם׃
Jika kamu berjalan menurut ketetapan-ketetapan-Ku, memelihara perintah-perintah-Ku, dan melakukannya,
Tosefta Rosh Hashanah (Lieberman)
If the moon has not been seen for two days, can they [then] sanctify it after two days? [There is a] instruction [of Scripture that] says: ”day” - there is only one day.