וַיֹּ֤אמֶר הַתִּרְשָׁ֙תָא֙ לָהֶ֔ם אֲשֶׁ֥ר לֹא־יֹאכְל֖וּ מִקֹּ֣דֶשׁ הַקֳּדָשִׁ֑ים עַ֛ד עֲמֹ֥ד כֹּהֵ֖ן לְאוּרִ֥ים וּלְתֻמִּֽים׃
And the Tirshatha said unto them, that they should not eat of the most holy things, till there stood up a priest with Urim and with Thummim. .
Read kabbalistic (mystical) interpretation of Ezra 2:63: and classical mystical sources.