John Gill Commentary Exodus 40:30

"And he set the laver between the tent of meeting and the altar, and put water therein, wherewith to wash." — Exodus 40:30 (ASV)

And he set the laver between the tent of the congregation
and the altar
Regarding this position, see (Exodus 30:18)

and put water there to wash with ;
for the priests to wash their hands and feet with; a type of that laver or fountain opened for the house of David and inhabitants of Jerusalem to wash in, (Zechariah 13:1) .