בְּבֹאָ֞ם אֶל־אֹ֣הֶל מוֹעֵ֗ד וּבְקָרְבָתָ֛ם אֶל־הַמִּזְבֵּ֖חַ יִרְחָ֑צוּ כַּאֲשֶׁ֛ר צִוָּ֥ה יְהוָ֖ה אֶת־מֹשֶֽׁה׃ (ס)
when they went into the tent of meeting, and when they came near unto the altar, they should wash; as the LORD commanded Moses.
Read kabbalistic (mystical) interpretation of Exodus 40:32: and classical mystical sources.