Galatians 3:19-20

Paul explains the purpose of God's Law

19 So why did God give his Law to his people after his promise to Abraham? He gave his Law to show them which things are wrong. It would have authority until Abraham's special descendant would come. This was the descendant that God had promised to bless. God used angels to give his Law to his people. It was Moses who received the Law from God. Moses then took it to God's people. 20 But God himself gave his promise to Abraham. It was not necessary to have somebody between them, like Moses.