וְנָֽתַתָּ֙ אֶת־הַכִּיֹּ֔ר בֵּֽין־אֹ֥הֶל מוֹעֵ֖ד וּבֵ֣ין הַמִּזְבֵּ֑חַ וְנָתַתָּ֥ שָׁ֖ם מָֽיִם׃
And thou shalt set the laver between the tent of meeting and the altar, and shalt put water therein.
Read kabbalistic (mystical) interpretation of Exodus 40:7: and classical mystical sources.