I wrote: > (For that matter the Tos' HaRosh IIRC mentions that the Baytusim and > Tzadukim had 2 conflicting approaches how to misinterpret the > Written/Oral Law, and much later the Minim had a 3rd approach. But > "Laws that the Tzadukim agree to" are common to all 3 break-away > groups.) It's actually a Tiferes Yisroel on Maseches Yodayim 4:6 - Danny