21 in the tent of meeting, at the outside of the vail, which [is] over the testimony, doth Aaron -- his sons also -- arrange it from evening till morning before Jehovah -- a statute age-during to their generations, from the sons of Israel.
21
In the tent of meeting, outside the curtain that shields the ark of the covenant law, 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.
Young's Literal Translation is in the public domain.