123 times the response ‘Halleluyah’ is said in Hallel , corresponding to the life of Aaron Perek / Halacha: Shabbos 16:1 Oz Vehadar / Artscroll: 97aVilna Shas: 79bAcademy of Hebrew Language: 437-8Venice / Bomberg: 15c
one word or two words? Perek / Halacha: Megillah 1:9 Oz Vehadar / Artscroll: 15bVilna Shas: 13aAcademy of Hebrew Language: 752Venice / Bomberg: 72a