Hi, Piano. Welcome.
Thank you, John1.
The context of the RSV, is clearly speaking of Jesus, beginning in 12:36, carrying the train of thought right on up through verse 43. Vs. 41 uses the pronoun "he", but in the earlier verses it is specifically "Jesus".
Isaiah 6:1, uses "the Lord", in the RSV.
I've always equated "the Lord" with the familial, or friendly, or affectionate, address of The Almighty--that is, of course, with Jesus; it seems to transfer readily between Old and New Testaments. And, the greatest commandment, "Thou shalt love 'the Lord' with all thy heart...", in Deuteronomy.