Numbers 8:3-7

And Aaron did so; he lighted the lamps thereof over against the candlestick, as the LORD commanded Moses.

And this work of the candlestick was of beaten gold, unto the shaft thereof, unto the flowers thereof, was beaten work: according unto the pattern which the LORD had shewed Moses, so he made the candlestick.

And the LORD spake unto Moses, saying,

Take the Levites from among the children of Israel, and cleanse them.

And thus shalt thou do unto them, to cleanse them: Sprinkle water of purifying upon them, and let them shave all their flesh, and let them wash their clothes, and so make themselves clean.