The book of Proverbs is a collection of essays, poems, and sayings expressing the wisdom of ancient Israel. Some of the material probably originated as folk wisdom, circulating in the family or the clan. Other parts reflect the life of the royal court. Arrangement began during the time of Solomon (about 961-922 B.C.), and the final edition was likely produced during the exile in Babylon (about 587-539 B.C.). Jeremiah 18:18 refers to the priest, the wise, and the prophet as leaders in Israel; the book of Proverbs is the product of the work of "the wise."