Exodus 27:21

In the Tent of Meeting, outside the curtain that is in front of the Testimony, Aaron and his sons are to keep the lamps burning before the LORD from evening till morning. This is to be a lasting ordinance among the Israelites for the generations to come.

(New International Version)

'In the tent of meeting, outside the veil which is before the testimony, Aaron and his sons shall keep it in order from evening to morning before the LORD; it shall be a perpetual statute throughout their generations for the sons of Israel.

(New American Standard Bible)

In the tabernacle of the congregation without the vail, which is before the testimony, Aaron and his sons shall order it from evening to morning before the LORD: it shall be a statute for ever unto their generations on the behalf of the children of Israel.

(King James Version)