Deuteronamy and Exodus say difrent things about why we keep shabbat.

Eitan’s Approach is that Exodus is what I think makes the most sense. His explination is that Exodus is what G-d said and Deuteronamy is what Moses taught. It makes sense because I’m sure that Moses wouldn’t say the exact words G-d said. But like all of them, I have a problem with it. Why did G-d let Moses teach different things than what He said? I think that He did that because they could see different sides of things.