Reference for Leviticus 21:1

וַיֹּ֤אמֶר יְהוָה֙ אֶל־מֹשֶׁ֔ה אֱמֹ֥ר אֶל־הַכֹּהֲנִ֖ים בְּנֵ֣י אַהֲרֹ֑ן וְאָמַרְתָּ֣ אֲלֵהֶ֔ם לְנֶ֥פֶשׁ לֹֽא־יִטַּמָּ֖א בְּעַמָּֽיו׃

And the LORD said unto Moses: Speak unto the priests the sons of Aaron, and say unto them: There shall none defile himself for the dead among his people;

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