In Numbers the Priestly source contributes chapters 1–10:28, 15–20, 25–31, and 33–36, including, among other things, two censuses, rulings on the position of Levites and priests (including the provision of special cities for the Levites), and the scope and protection of the Promised Land. The Priestly themes in Numbers include the significance of the priesthood for the well-being of Israel (the ritual of the priests is needed to take away impurity), and God's provision of the priesthood as the means by which he expresses his faithfulness to the covenant with Israel.