The Sacrificial System

In Isaiah, it's more talking about the deliverance and salvation that God will provide from the nations who are oppressing them. It shows up early on even in a name like Joshua, which talks about God being the one who saves. And so in that sense, salvation is not an unknown concept. The question is, do they have the concept of being saved from their sins? They may be saved from the consequences of their sins; but our sin itself is taken away.