"... There is little consensus, but Hays’ messianic exegesis, which evokes the narrative of the psalm and locates Christ’s proclamation in the context of the Davidic Messiah, seems likely, providing, as Hays argues, a framework for reading the whole catena. Paul makes use of this psalm of thanksgiving, attributed to the Lord’s servant, David, by highlighting the psalmist’s confession of the Lord among the nations. ‘Therefore I will confess you among the Gentiles, and sing praises to your name.’ This first citation (Romans 15:9) is likely to be from Psalm 18:49 (LXX 7:50), although LXX 2 Samuel 22:50 is a possible source because of its similar wording. It is represented verbatim apart from the omission of the vocative κύριε, quite possibly, as Hays says, because it is the 'Lord' who speaks. Christ is the one who has welcomed Jew and Gentile, so it is quite possible that he himself is standing in the midst of the eschatological congregation, offering praise to God. Wagner sees Christ as the referent, but he also points out that Paul perceives his own ministry to be following that of Christ ..."