Sforno on Leviticus 24:2/ספורנו על ויקרא כ״ד:ב׳

1'צו את בני ישראל ויקחו אליך שמן וגו, after the oil which had been donated before the Tabernacle had been built and erected, G’d commanded that the Israelites for all future generations should provide this oil as their contribution.