שמות ל:יח פירוש: רש״י, ספורנו, אור החיים ורבנו בחיי

כיור A LAVER — like a large pot with teats which discharged water by the way of their openings.

ועשית כיור, this is another vessel which has not been mentioned before with the other vessels that were part of the Tabernacle. The reason is that the basin was not instrumental in attracting the presence of the Shechinah to the Tabernacle. Its function was merely preparatory to the priests’ service in the Tabernacle.

ונתת שמה מים. "you will put water into it." Apparently it did not have to be Moses who had to fill the basin with water. Any non-priest was qualified to perform that chore.