In the strict sense, in Judaism, unlike Christianity and Islam, there are no fixed universally binding articles of faith, due to their incorporation into the liturgy. Scholars throughout Jewish history have proposed numerous formulations of Judaism's core tenets, all of which have met with criticism. The most popular formulation is Maimonides' thirteen principles of faith, developed in the 12th century. According to Maimonides, any Jew who rejects even one of these principles would be considered an apostate and a heretic. Jewish scholars have held points of view diverging in various ways from Maimonides' principles. Thus, within Reform Judaism only the first five principles are endorsed.