King James Version (KJV)
Seven days shall they purge the altar and purify it; and they shall consecrate themselves. {consecrate...: Heb. fill their hands}
Modern English
Seven days shall they make atonement for the altar and purify it. So shall they consecrate it.
Hebrew
שִׁבְעַ֣ת יָמִ֗ים יְכַפְּרוּ֙ אֶת־הַמִּזְבֵּ֔חַ וְטִֽהֲר֖וּ אֹת֑וֹ וּמִלְא֖וּ ידו יָדָֽיו׃
shibʿat yamiym ykaprv ʾet-hamizbeḥa vṭiharv ʾotvo vmilʾv ydv yadayv