Talmud for Megillah 7:6

One asks about practices of Passover at Passover, practices of Pentecost at Pentecost, practices of Tabernacles at Tabernacles⁶⁸Babli Megillah 4a. Sifry Num. 66.. In the House of Assembly one asks thirty days in advance; Rabban Simeon ben Gamliel says, two weeks⁶⁹Babli Pesaḥim 6a.. The statement of Rebbi Joḥanan follows the rabbis, that of the colleagues Rabban Simeon ben Gamliel. Rebbi Joḥanan said, the reason of the rabbis, because Moses stands on the First Passover and explains to them the rules of Second Passover⁷⁰The rules of the Second Passover to be celebrated on the 14^th of Iyar by people impure on the 14^th of Nisan were promulgated on the 13^th of Nisan, Num.9:9–14.. That of the colleagues follows Rabban Simeon ben Gamliel, because Moses stands on the day of the New Moon and explains to them the rules of Passover⁷¹Num. 9:1–4..