Rabbi Jehudah ha-levi explains to the Kuzarite king his faith as follows: “We believe in the God of our forefathers, who brought the Israelites forth from Egypt by signs and miracles, sustained them in the wilderness with manna, divided for them the sea and Jordan, gave them the Law through Moses, exhorted them through His prophets to obey His commandments: in short, we believe all that is written in the Torah” (Kuzari, i. 8). He then explains philosophically “the root of the faith” in the following ten propositions: (1) The universe is finite; (2) it had a beginning; (3) the time of the beginning had to be determined by the Divine Being; (4) God is without a beginning; (5) God is eternal (i.e., without an end); (6) incorporeal; (7) omniscient; (8) all-wise, all-powerful, living; (9) free in His actions; (10) without change. To these must be added the belief in prophecy, in the truth of the prophecies, and in man’s free-will, which he fully discusses in the course of the book. Rabbenu Bachya, in his “Duties of the Hearts” (‏חובות הלבבות‎), considers also faith as one of these duties, and expresses it in the most simple form, “Belief in God and in His Law.” He does not, however, devote a special chapter to faith. The first chapter treats of the distinctively Jewish creed of God’s Unity, but less as a duty of belief than as a duty of research and study for the purpose of philosophically establishing that God is One. The author states only briefly in the prefatory notes to the first chapter, that it is our duty to believe in the Existence, Providence, and Unity of God, as commanded in the verse, “Hear, O Israel, the Lord is our God, the Lord is One.” Maimonides comprehended our belief in thirteen articles, known as the Thirteen Principles of our Creed. He insists on the fact that these articles are not the product of chance; they are the result of long study and deep research. Every one of them is essential, and he who rejects any of them is an infidel (‏כופר‎), and puts himself by such rejection outside the Jewish community (‏יוצא מכלל ישראל‎).