Exodus 40:2, 17-18

On the first day of the first month shalt thou set up the tabernacle of the tent of the congregation.

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. And Moses reared up the tabernacle, and fastened his sockets, and set up the boards thereof, and put in the bars thereof, and reared up his pillars.