But JESUS said....
Jesus answered, “The work of God is this: to believe in the one he has sent.”
Yet believing does result in obedience. but obedience to man is conditional, and while those who sat in the seat of Moses over Israel as the stewards of Divine revelation and inheritors of the promises,. (Rm. 3:2; 9:4) did have authority, this did not require or render them to be infallible, yet as with Rome, they presumed a level of assured veracity above that which is written.
For the decision of their [Pharisees] Scribes, or "Soferim" (Josephus, σοπισταί; N. T., γραμματεἴς), consisting originally of Aaronites, Levites, and common Israelites, they claimed the same authority as for the Biblical law, even in case of error (Sifre, Deut. 153-154); they endowed them with the power to abrogate the Law at times (see Abrogation of Laws). - http://www.jewishencyclopedia.com/articles/12087-pharisees.