The Decalogue - When Did Moses Come Down?

In Deuteronomy 12 and Leviticus 17, the altar is only located in the temple in Jerusalem. In Exodus 27, which we'll get to next time, the altar for the tabernacle is made of bronze. The Decalogue seems to have been spoken to Moses rather incredibly while he was down off the mountain. And it seems like these different traditions were woven together here again without any concern about, oh, no, is this going to work? They didn't care.