From the early Church Fathers to now.
1 Jewish · 1 Catholic · 1 Reformed
“Then returning from Galgal, where the idols were, be said to the king: I have a secret message to thee, O king. And he commanded silence: and all being gone out that were about him,”
“He then returned alone. From the quarries. An area where stones were excavated from the mountain. Similarly, Yonasan renders "from the quarries." Then he went to Eglon, and declared to him. He said, "Hsst." Eglon said, "Silence everyone near me!" Yonasan renders, "Leave!"—remove everyone. Still, the term connotes silence.”
“Idols. Hebrew pesilim. Some take these to be only heaps of stones. Protestants, “quarries.” (Haydock) — But the Septuagint, &c., represent them as “carved” idols. The same expression is used [in] Exodus xx. 4., &c. The Moabites had probably placed idols here, to profane that sacred place, which was resorted to out of devotion by the Israelites, Osee iv. 14., and Amos iv. 5. Here also the prophets inform us that the ten tribes adored and consulted idols; resembling perhaps that of Michas, chap. xvii. 4. — Silence to Aod, (Calmet) that none of the people might be able to divulge the secret. Hebrew, “be thou silent.” (Menochius)”
“quarries--rather, "graven images" (Deu 7:25; Jer 8:19; Jer 51:52); statues of Moabite idols, the sight of which kindled the patriotic zeal of Ehud to avenge this public insult to Israel on its author. I have a secret errand unto thee, O king: who said, Keep silence--"Privacy"--a signal for all to withdraw.”
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.