In describing Jesus as “Lord”, Paul quotes scriptures about YHWH (God) so-as to make the quote's instance(s) of “LORD” (i.e. YHWH) contextually designate Jesus.
This page analyzes four examples:
In describing Jesus, and calling him “Lord”, Paul’s letters cite or harken back to Old Testament quotes (with concepts and expressions) about “Lord” (YHWH) but in contexts that make them about “Lord” (Jesus).
In his letters (about religious matters), Paul habitually attributes to Jesus the title “lord.”
This is relevant for two reasons:
A) Unless Paul was intending it as a YHWH-substutition, such a frequent use of the honorific title is unprecedented and inexplicable.
B) Paul was not an inept communicator. Christians regularly referred to God as “Lord” [Forthcoming] Given the frequency and religious contexts in which Paul called Jesus “Lord”, Paul would have rightly expected readers to interpret him as using it in the YHWH-substitution sense. (And yet despite the obvious “risks” he continued to do so without worry, as if that is precisely what he intended.) This is exacerbated since Paul calls Jesus, not simply Lord, but “the” Lord.
The church lead by the apostles in Jerusalem publicly maintained that Jesus was properly designated as κύριος in the YHWH-sense.
A full page will cover these arguments:
This is relevant because the Jerusalem church's teachings-traditions and Paul's teachings-traditions largely matched.[Forthcoming]