Gregory the Dialogist

If I shall be judged, I know that I shall be found just. Which too is not at variance with the person of the self-same blessed Job, since he is only telling that concerning himself without, which 'Truth' had inwardly declared to his enemy concerning him; Hast thou considered My servant Job, that there is none like him in the earth? And yet it is much less that the holy man records concerning himself, than what the Lord declared concerning him. …

Morals on the Book of Job, Book XI ↗

Thomas Aquinas

In another way he renders them attentive by assuring them of the truth of what he is about to say, and so he says, "If I am judged, I know I will be found just," which he certainly does not say about his own innocence, since he has already said, "I will blame my own conduct in His presence." (v.15) But he says this of the truth of the doctrine about which they were disputing as though in a trial. The one is found just in a trial in whose favor the sentence is decided. …

Commentary on Job ↗