Exodus 40:14-18

You shall also bring his sons and put tunics on them;

and you shall anoint them just as you have anointed their father, so that they may serve as priests to Me; and their anointing will qualify them for a permanent priesthood throughout their generations.”

So Moses did these things; according to all that the Lord had commanded him, so he did.

Now in the first month of the second year, on the first day of the month, the tabernacle was erected.

Moses erected the tabernacle and laid its bases, and set up its boards, and inserted its bars, and erected its pillars.