Charles Ellicott Commentary 2 Kings 11:5-6

"And he commanded them, saying, This is the thing that ye shall do: a third part of you, that come in on the sabbath, shall be keepers of the watch of the king`s house; And a third part shall be at the gate Sur; and a third part at the gate behind the guard: so shall ye keep the watch of the house, and be a barrier." — 2 Kings 11:5-6 (ASV)

Three companies of the guards to be stationed at the three approaches to the palace.