Exodus 27:20 in the King James Version
And thou shalt command the children of Israel, that they bring thee pure oil olive beaten for the light, to cause the lamp to burn always.
Context
19 All the instruments of the tabernacle in all its service, and all its pins, and all the pins of the court, shall be of bronze.
20 “You shall command the children of Israel, that they bring to you pure olive oil beaten for the light, to cause a lamp to burn continually.
21 In the Tent of Meeting, outside the veil which is before the covenant, Aaron and his sons shall keep it in order from evening to morning before the LORD: it shall be a statute forever throughout their generations on the behalf of the children of Israel.