And this is the offering which ye shall take of them: gold, silver, and brass; and blue and purple and scarlet, and fine linen, and goats’ hair; and rams’ skins dyed red, etc. (Exod. 25:3). The Holy One, blessed be He, said to them: Actually You do not bring your own possessions, but the spoils I gave you at the Red Sea, as it is said: The wings of the dove are covered with silver (Ps. 68:14). And blue and purple and scarlet (Exod. 26:8). Blue, for they were dipped into the blood, to symbolize the blood that the patriarchs had already prepared (i.e., the blood of circumcision). It was called scarlet (tola’at), because it is said: Fear not, thou worm (tola’at) Jacob (Isa. 41:14). The rams’ skins are mentioned to because of the merit of Jacob, as it is said: And she put the skins of the kids of the goats upon his hands (Gen. 27:16). The Holy One, blessed be He, declared: The heavens and the heavens of the heavens cannot contain Me, yet I caused My Shekhinah to dwell within the skins of the kids of the goats.
Another explanation of blue, and purple … and rams’ skins … oil for the light, etc. R. Judah the son of R. Simon stated: Do not imagine that you are repaying Me. The thirteen things you have set aside for Me are the thirteen things I did in your behalf in Egypt: I clothed thee also with richly woven work, and shod thee with sealskin, and I wound fine linen about thy head, and covered thee with silk. I decked thee also with ornaments, and I put bracelets upon thy hands, and a chain on thy neck. And I put a ring upon thy nose, and earrings in thine ears, and a beautiful crown upon thy head (Ezek. 16:10–12). My bread also which I gave thee, fine flour, and oil and honey, wherewith I fed thee (ibid., v. 19).
Thus the thirteen things you have set aside for Me I will consider to be repayment to Me, as David said: I will sing unto the Lord, because He hath repaid me (Ps. 13:6). However, in the world-to-come, I will reward you for the thirteen things you have set aside for Me. And the Lord will create over the whole habitation of Mount Zion, and over her assemblies, a cloud and smoke by day, and the shining of a flaming fire by night; for over all the glory shall be a canopy. And there shall be a pavilion for a shadow in the daytime from the heat, and for a refuge and for a covert from storm and from rain (Isa. 4:5–6). Though you have (merely) paid Me back, yet I agree that you have dealt bountifully with Me, as it is written after that: Let me sing of my well-beloved (ibid. 5:1). Hence, I will sing unto the Lord, because He hath dealt bountifully with me (Ps. 13:6).