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What is a…
urim

Meaning: lights

Vulgate: doctrina

Septuagint: revelation)

…he shall stand before Eleazar the priest, who shall inquire for him by the judgment of the Urim before the Lord… —Numbers 27:21 NASB

When Saul saw the camp of the Philistines, he was afraid and his heart trembled greatly. When Saul inquired of the Lord, the Lord did not answer him, either by dreams or by Urim or by prophets. —1 Samuel 28:5-6 NASB

See: Thummim.