Leviticus 24:4 - Ellicott's Commentary On The Whole Bible

The lamps upon the pure candlestick. — Though it would appear from Exodus 25:31 that the candlestick was called pure because it was made entirely of pure gold, yet, according to the authorities during the second Temple, the order here is that “he shall arrange the lamps after having purified and made clean the candlestick, and removed all the cinders.”