שִׁבְעַ֣ת יָמִ֗ים יְכַפְּרוּ֙ אֶת־הַמִּזְבֵּ֔חַ וְטִֽהֲר֖וּ אֹת֑וֹ וּמִלְא֖וּ ידו [יָדָֽיו׃]
Seven days shall they make atonement for the altar and cleanse it; so shall they consecrate it.
Read midrashic interpretation of Ezekiel 43:26: and classical rabbinic exegesis.