Exodus 40:7
Place the basin between the tent of meeting and the altar and put water in it. The basin is placed between the tent and the altar — exactly as Exodus 30:18 specified. The washing station that the priests must use before both entering the tent and serving at the altar is positioned at the midpoint of the priestly approach sequence. Water in the basin: the installation is not complete until the basin is filled. The empty basin is a construction; the filled basin is a service.