2 Kings 11:6
"Here's what we'll do: A third of you will enter here on this coming Sabbath dressed as guardians of the watch for the king's palace, with a third of you at the Sur gate, and a third at the gate behind the guards. Keep watch over the palace and defend it.
1 Chronicles 26:13-19
assigned by lottery according to their ancestral households, whether large or small alike, for their gate assignments.
2 Chronicles 23:4-5
"Look! The king's son is going to rule, just as the LORD promised David's descendants. So here's what you'll need to do: One third of you priests and descendants of Levi who are on duty during the Sabbath will serve as guards at the temple gates.