Exodus 30:1-3
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1And thou shalt make an altar to burn incense upon: of shittim wood shalt thou make it. 2A cubit shall be the length thereof, and a cubit the breadth thereof; foursquare shall it be: and two cubits shall be the height thereof: the horns thereof shall be of the same. 3And thou shalt overlay it with pure gold, the top thereof, and the sides thereof round about, and the horns thereof; and thou shalt make unto it a crown of gold round about.
Exodus 30:1-3 (KJV)