Oh yes, Paul was quoting the gospel of Matthew there in
Acts 19...ah yes I see. So every time someone says "Jesus" they are preaching...ok.
Oh yes, someone can inform the lost about the gospel without ever referencing the text of Scripture...."ahhh yes, I see" 
! See how easy that was?
Im not gonna keep answering that just because you either did not read my answer the first time or just did not like it. But like I said I have sat in meetings where the Preacher never got to a specific text and exegetically expounded it.
Likewise, I'm not going to keep explaining to you that preaching does indeed inherently contain the idea of referencing the text of Scripture....or else we have to tell lost people about the biblical gospel without using the Bible !