TSK · Numbers 27:21

He placed the breastplate on him; and in the breastplate he put the Urim and the Thummim.

who may go out before them, and who may come in before them, and who may lead them out, and who may bring them in; that the congregation of Yahweh not be as sheep which have no shepherd."

Of Levi he said, "Your Thummim and your Urim are with your godly one, whom you proved at Massah, with whom you strove at the waters of Meribah;

It happened after the death of Joshua, the children of Israel asked of Yahweh, saying, "Who should go up for us first against the Canaanites, to fight against them?"

The children of Israel went up and wept before Yahweh until evening; and they asked of Yahweh, saying, "Shall I again draw near to battle against the children of Benjamin my brother?" Yahweh said, "Go up against him."

It happened, while Saul talked to the priest, that the tumult that was in the camp of the Philistines went on and increased: and Saul said to the priest, "Withdraw your hand!"

David knew that Saul was devising mischief against him; and he said to Abiathar the priest, "Bring the ephod here."

David said to Abiathar the priest, the son of Ahimelech, "Please bring me here the ephod." Abiathar brought the ephod to David.

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