You are not to do as we are doing here today, where everyone does what seems right in his own eyes.
8 Ye shall not do after all. Even then they observed the rite of sacrifice handed down to them from the fathers; but since as yet they were wandering in the desert, it was lawful for them to build altars anywhere, until an end should be put to their journeyings.
There is not any one particular precept (as I remember) in all the law of Moses so largely pressed and inculcated as this, by which they are all tied to bring their sacrifices to that one altar which was set up in the court of the tabernacle, and there to perform all the rituals of their religion; for, as to moral services, then, no doubt...
Commenting on Deuteronomy 12:5-32
Ye shall not do after all the things that we do here,.... In the wilderness, where they had no abiding, but were continually removing from place to place, and could not always observe punctually and precisely the exact order and time of their sacrifices and other things, nor offer them at any certain place, and many were doubtless neglected by them; see Amo 5:25.