The chambers - Render it: and chambers, not yet described. They were north of the altar, by the “posts” or pillars in front and along the sides of the gate-building. There were several gates in the gate-building.
Related Commentaries of Ezekiel 40:38
Ezekiel 40:38
38 And the chambers and the entries thereof were by the posts of the gates, where they washed the burnt offering.