His divine righteousness
And first, what is the righteousness of Christ. It is twofold, either his divine or his human righteousness.
His divine righteousness belongs to his divine nature, as he is the one who exists. He who exists, over all, God, blessed forever (Romans 9:5), the supreme, the eternal. Equal with the Father as touching his godhead, though inferior to the Father as touching his manhood. Now this is his eternal, essential, immutable holiness, his infinite justice, mercy, and truth, in all of which he and the Father are one (John 10:30).
1771 text
And I. What is the righteousness of Christ? It is twofold, either his divine or his human righteousness.
1. His divine righteousness belongs to his divine nature, as he is Ὁ ὠν. He that existeth, over all, God, blessed for ever: the supreme, the eternal: “Equal with the Father, as touching his godhead, tho’ inferior to the Father, as touching his manhood.” Now this is his eternal, essential, immutable holiness; his infinite justice, mercy and truth: in all which he and the Father are one.