Deuteronomy 33:8

Let thy Urim — The Thummim and the Urim, which are thine, O Lord by special institution and consecration, (by which he understands the ephod in which they were put, and the high priesthood, to which they were appropriated, and withal the gifts and graces signified by the Urim and Thummim, and necessary for the discharge of that high — office) shall be with thy holy one, that is, with that priest, whom thou hast consecrated to thyself, and who is holy in a more peculiar manner than all the people were; that is, the priesthood shall be confined to and continued in Aaron's family. Whom thou didst prove — Altho' thou didst try him, and rebuke him, yet thou didst not take away the priesthood from him. At Massah — Not at that Massah mentioned Exodus 17:7, which is also called Meribah, but at that other Meribah, Numbers 20:13. Thou didst strive — Whom thou didst reprove and chastise.