In the tabernacle of meeting, outside the veil which is before the Testimony, Aaron and his sons shall tend it from evening until morning before the LORD. It shall be a statute forever to their generations on behalf of the children of Israel.
Exodus 27:21
Surrounding context
27:20 "And you shall command the children of Israel that they bring you pure oil of pressed olives for the light, to cause the lamp to burn continually.
27:21 In the tabernacle of meeting, outside the veil which is before the Testimony, Aaron and his sons shall tend it from evening until morning before the LORD. It shall be a statute forever to their generations on behalf of the children of Israel.