https://www.ou.org/shloshim-yom-kodem-hachag/
Shloshim Yom Kodem HaChag - Orthodox Union
Sep 8, 2020 - The very first halacha about Pesach in Shulchan Aruch is "We investigate the laws of Passover for thirty days before Passover" (Orach Chaim 229:1). As
shloshim yom kodemorthodoxunion