Rabbi Simlai said, "Six hundred and thirteen commandments were given to Moses, 365 negative commandments, answering to the number of the days of the year, and 248 positive commandments, answering to the number of a man's members. Then David came and reduced them to eleven [Psalm 15]. Then came Isaiah, and reduced them to six [Isaiah 63.15]. Then came Micah, and reduced them to three [Micah 6.8]. Then Isaiah came again, and reduced them to two, as it is said, 'Keep ye judgment and do righteousness.' Then came Amos, and reduced them to one, as it is said, 'Seek me and live.' Or one may say, then came Habakkuk [2.4], and reduced them to one, as it is said, 'The righteous shall live by his faith.'"

(The Talmud)