Мидраш к Шмот 40:18

They said to him: “Did you not tell us to do such-and-such?” He replied: “Yes, indeed.” And so they pointed to everything that had been done. They said: “If that is so, why does it not stand? We tried to have Bezalel, Oholiab, and the wise-hearted erect it, but they were unable to do so.” Moses was troubled by all this until the Holy One, blessed be He, told him: Moses, because you were unhappy over the fact that you did not share in the work of the building of the Tabernacle, these wise men are not able to erect it. Now Israel will know that if you do not erect it, it will never be set up. Have I not written previously that it would be done by you, as it is said: And Moses reared up the Tabernacle (Exod. 40:18)? And it says also: And the Lord spoke unto Moses, saying: And the first day of the first month (Nisan) shalt thou rear up the Tabernacle of the Tent of Meeting (ibid., v. 2). Moses replied: Master of the Universe, I do not know how to erect it either. He said to him: Apply yourself to it and it will stand up of itself, for I have written concerning you that you will raise it, as is said: And it came to pass in the first month in the second year on the first day of the month, that the Tabernacle was reared up (ibid., v. 17). Who finally set it up? Moses, as it is said: And Moses reared up the Tabernacle.

This is one of the three things to which Moses devoted himself: the law, judgeships and Israel. R. Hiyya the son of Yosé said: Moses also was deeply involved in the building of the Tabernacle. And it is called by his name. R. Hiyya the son of Yosé said: Throughout the seven days of consecration, Moses took apart the Tabernacle twice each day and then assembled it. The elder R. Hiyya said: He did it three times each day, for it is said: Thou shalt rear up (Exod. 40:1), The Tabernacle was reared up (ibid., v. 17), and Moses reared up the Tabernacle (ibid., v. 18).