did God tell Israel at the giving of the Law that Christ would die and bring grace?
No. At the giving of the Law, God did not tell Israel or the world that Christ would one day die and send grace. Scripture is a progressive revelation; God did not reveal everything upfront. Israel then remained under the Law’s burden for 1,500 years until the faith way was revealed.
Les teaches that Scripture is a progressive revelation, meaning God did not tell everything up front. When God gave the Law, He did not tell Israel and the rest of the world that one day Christ would die and suddenly send the world grace. Israel was under the burden of the Law constantly, 24 hours a day, knowing nothing of liberty but constant fear, because the Law brought death. They were kept shut up under that burden until the faith which should afterwards be revealed. So Israel went 1,500 years under the Law, and then progressively God reveals these tremendous doctrines of grace.