2 Chronicles 4:2

Also he made a molten sea, cast from bronze or brass, of ten cubits from brim to brim, that is, in diameter, round in compass, and five cubits the height thereof; and a line of thirty cubits, in a rough measurement, did compass it round about, the exact circumference being not quite 31 ½ cubits. It was a large reservoir for the water used by the priests and Levites in the performance of their duties, especially for the many washings enjoined upon them.