It was agreed that avoidance of idolatry, fornication, and the eating of flesh cut from a living animal should be demanded of Gentiles who wished to become Christians.
[3] The Tosaphist Rabbeinu Tam wrote that Peter was "a devout and learned Jew who dedicated his life to guiding gentiles along the proper path".
[citation needed] Rabbeinu Tam also taught that Peter was the author of the Shabbat and feast-day[4] prayer Nishmat, and this was a popularly held belief through the Middle Ages.
[specify][5] Otzar Hatefillah, quoting Mahzor Vitri, pointedly denies this claim, offering instead Simeon ben Shetach as the probable author.
[6] According to an ancient Jewish tradition, Peter was sent by the rabbis in order to move Christianity in its own direction, to prevent it from being considered another branch of Judaism.