Ambrose of Milan

We have taken up the task of writing an apology for the present style of the prophet David, not because he needs this gift, who has excelled in such great merits and flourished in virtues, but because many people, reading the sequence of his deeds without considering the power of the Scriptures or the hidden mysteries, wonder how such a great prophet did not avoid the contagion of adultery first and then of murder. Therefore, it was our desire to review the history itself, which seems to have been exposed to sin. …

Apology for the Prophet David, Chapter 1 ↗

Jerome

David was a man after God's own heart, and his lips had often sung of the Holy One, the future Christ. Yet as he walked upon his housetop he was fascinated by Bathsheba's nudity, and [he] added murder to adultery. Notice here how, even in his own house, a man cannot use his eyes without danger. Then repenting, he says to the Lord, "Against you, you only, have I sinned and done this evil in your sight." Being a king he feared no one else.

Letter 22.12 ↗

Gregory the Dialogist

For who, that hears of it, not only among believers but of unbelievers themselves also, does not utterly loathe this, that David walking upon his solar lusteth after Beershebah the wife of Uriah? Yet when he returns back from the battle, he bids him go home to wash his feet. Whereupon he answered at once, "The Ark of the Lord abideth in tents, shall I then take rest in my house?" David received him to his own board, and delivers to him letters, through which he must die. …

Morals on the Book of Job, Book 3, Section 55 ↗