Purifications or Baptisms of Priests Performed in the Brazen Laver
Source: TTT
Exodus 30:18
“You are to make a bronze basin with a bronze stand for washing. Set it between the Tent of Meeting and the altar, and put water in it,
2 Chronicles 4:6
He also made ten basins for washing and placed five on the south side and five on the north. The parts of the burnt offering were rinsed in them, but the priests used the Sea for washing.