Ezekiel 46:12

A voluntary burnt offering. — One case in which the prince might present a sacrifice is yet unprovided for. He might offer, like any of the people, a voluntary sacrifice at any time, either a burnt offering or a peace offering. In this case he is still to enter by the east gate; but the gate, instead of standing open until evening, as on the Sabbaths and new moons, is to be immediately shut as soon as he retires after the completion of the sacrifice.