Numbers 27:21

“You shall put in the breastpiece of judgment the Urim and the Thummim, and they shall be over Aaron’s heart when he comes in before Yahweh; and Aaron shall carry the judgment of the sons of Israel over his heart before Yahweh continually.

He then placed the breastpiece on him, and in the breastpiece he put the Urim and the Thummim.

So Moses brought their case near before Yahweh.

So the men of Israel took some of their provisions, but they did not ask for the command of Yahweh.

Now it happened after the death of Joshua that the sons of Israel asked of Yahweh, saying, “Who shall go up first for us against the Canaanites, to fight against them?”

Then the sons of Israel arose, went up to Bethel, and asked of God and said, “Who shall go up for us to begin the battle against the sons of Benjamin?” Then Yahweh said, “Judah shall begin it.”

And it happened that while Saul talked to the priest, the commotion in the camp of the Philistines continued and increased; so Saul said to the priest, “Withdraw your hand.”

“And he asked of Yahweh for him, gave him provisions, and gave him the sword of Goliath the Philistine.”

So Saul asked of Yahweh, but Yahweh did not answer him, either by dreams or by Urim or by prophets.

And there was a famine in the days of David for three years, year after year; and David sought the presence of Yahweh. And Yahweh said, “It is for Saul and his bloody house, because he put the Gibeonites to death.”

The governor said to them that they should not eat from the most holy things until a priest stood with Urim and Thummim.

“For the lips of a priest should keep knowledge, and men should seek instruction from his mouth; for he is the messenger of Yahweh of hosts.