Exodus 27:21
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.
Cross-reference
Exodus 26:31-33 describes the veil that separates the Holy Place — the very veil outside which the lamp is placed, defining its location.
Exodus 40:3 instructs to screen the ark with the veil — the same veil the lamp is set outside, clarifying the spatial layout.
Exodus 25:37 gives the making of the seven lamps, which are tended as described in the main verse.
Exodus 30:7 describes dressing the lamps with incense each morning, directly connecting to the daily tending.
Exodus 39:37 lists the completed lampstand with its lamps and oil, the very items tended in the main verse.
Exodus 16:34 places manna 'before the testimony' — the same testimony (ark) that the veil in front of the lamp screens.
Exodus 25:16 commands putting the testimony into the ark — the ark that the veil in front of the lamp shields from view.
Exodus 25:21 places the mercy seat on the ark containing the testimony — the same object behind the veil where the lamp is.
Leviticus 24:3 repeats this exact command for Aaron to tend the lamps from evening till morning before the LORD.
In 1 Samuel 3:3, the same lamp of God is referenced, still burning in the tabernacle at Shiloh, showing continuity of this practice.
In 2 Chronicles 13:11, the daily evening lighting of the lamps is described as part of the temple worship, echoing this command.
Leviticus 24:2 commands bringing oil for the lamp to keep it burning regularly, reinforcing the same perpetual light instruction.
Numbers 4:16 assigns Eleazar charge over the oil for the light, directly related to the lamp tending duty.
2 Chronicles 4:20 records the lampstands in Solomon's temple burning before the inner sanctuary, exactly as prescribed here.
Hebrews 9:6 describes the priests' daily service in the outer tent where this lampstand was tended, showing the practice continued.
Psalm 134:1 calls those who minister by night in the house of the LORD to praise Him — echoing the night lamp-tending duty.