Exodus 40:2, 17-18

On the first day of the first month shalt thou rear up the tabernacle of the tent of meeting.

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 laid its sockets, and set up the boards thereof, and put in the bars thereof, and reared up its pillars.