The interpretation timeline

2Sam 16:21

How this passage has been read — the sources, oldest to newest.

From the early Church Fathers to now.

2Sam 16:21 · Douay-Rheims
“And Achitophel said to Absalom: Go in to the concubines of thy father, whom he hath left to keep the house: that when all Israel shall hear that thou hast disgraced thy father, their hands may be strengthened with thee.”
Patristic before A.D. 750
470
A.D.
Salvian the Presbyter Patristic
c. A.D. 400–470
“He was expelled from his kingdom and fled as an exile to escape murder. You do not know of a son more wicked and bloodthirsty. Because he could not kill his father in his attempt to murder him, he defiled him with incest. By heaping crime on crime, he achieved an incest beyond all incest. He committed in public a thing most shameful to his father, a crime which is abominable in secret. Not only his absent father was made to look hideous by his son's deadly crime, but the eyes of all were polluted by his public incest.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.