Midrash su Esodo 26:35

“His left is under my head and his right embraces me” (Song of Songs 2:6).
“His left is under my head,” these are the first tablets; “and his right embraces me,” these are the second tablets. Alternatively, “his left is under my head,” these are ritual fringes; “and his right embraces me,” these are phylacteries. Alternatively, “his left is under my head” this is the reciting of Shema; and his right embraces me,” this is the Amida prayer. Alternatively, “his left is under my head,” this is sukka; “and his right embraces me,” this is the cloud of the Divine Presence in the future. That is what is written: “The sun will no longer be for you the light of day and the glow of the moon will not illuminate for you” (Isaiah 60:19). Who illuminates for you? “The Lord will be for you an eternal light” (Isaiah 60:19). Alternatively, “his left is under my head,” this is mezuza.” Rabbi Shimon ben Yoḥai taught: “You shall write them on the doorposts of your house” (Deuteronomy 6:9), when you enter from the marketplace to your house.⁷⁷It is on the right of the person entering the house, which is the left of the person exiting.
Rabbi Yoḥanan said: It is written: “You shall position the table outside the curtain [and the candelabrum opposite the table, on the side of the Tabernacle toward the south; and you shall put the table on the north side]” (Exodus 26:35).⁷⁸Since the Divine Presence emanated from the Holy of Holies, the candelabrum was to its right and the table was to its left. But that is not the case; a person places a candelabrum on the left so it will not restrict the right. A person does not place the left under the head and embrace with the right.⁷⁹The unusual placement of the candelabrum and the table reflect the fact that God’s embrace of Israel is not, as it were, for His comfort, but rather in order to support them (Midrash HaMevoar; cf. Matnot Kehuna).
Rabbi Aḥa said: Rabbi Yoḥanan cites it from this verse: “To love the Lord your God…and to cleave to Him” (Deuteronomy 30:20). What is this cleaving? “His left is under my head.”

In the tent of meeting, without the veil (Exod. 27:21). In case you are inclined to assert that He required the light, the menorah was placed before the curtain near the ark, outside of the veil. This was to demonstrate to you that He did not require the light supplied by man. Usually, when a human king constructs a bed and a table, he places a lamp on the table at his left side, but in the Temple, the Menorah was placed at the right of the table, as it is said: And thou shalt set the table without the veil, and the candlestick over against the table (Exod. 26:35). This was done to teach you that He does not require your light. It was instituted solely for your sake, so that the world would be illumined in the future, when darkness descends upon the nations of the world, as it is said: For, behold, darkness shall cover the earth, and gross darkness the peoples; but upon thee the Lord will arise, and His glory shall be seen upon thee (Isa. 60:2).