Matthew 5:15 (the Sermon on the Mount):
Neither do men light a candle, and put it under a bushel, but on a candlestick; and it giveth light unto all that are in the house.
A bushel is a vessel, such as a bucket , of a capacity of one bushel (8 gallons , about 36 litres) used as a measure. So you'd be lighting a candle and putting a bucket over it , the light then being under a bushel.