Possible Duplicate: Why don’t we just follow the shittah of Moshe Rabeinu? If the Oral Torah is Divine, how are there arguments in the Mishnah and Gemara? (I have heard this question asked ...
My question can apply to virtually all mitzvos where there is a disagreement in the standard way to fulfill them. If one reads the hakdama (introduction) to the Rambam's peirush mishnayos (commentary ...