The interpretation timeline
Luke 21:6 Douay-Rheims

These things which you see, the days will come in which there shall not be left a stone upon a stone that shall not be thrown down.

A.D. 339 – 1863 5 witnesses

Patristic

before A.D. 750
339
A.D.
c. A.D. 260–339
“How beautiful was every thing relating to the structure of the temple, history informs us, and there are yet preserved remains of it, enough to instruct us in what was once the character of the buildings. But our Lord proclaimed to those that were wondering at the building of the temple, that there should not be left in it one stone upon another. For it was meet that that place, because of the presumption of its worshippers, should suffer every kind of desolation.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“As for these things which ye behold,.... Some, as the Syriac and Ethiopic versions, read these words by way of interrogation; "are these the things which ye behold?" do ye look upon these with wonder and delight? the days will come; and they are hastening on; a little while, a few years more: in the which there shall not be left one stone upon another, that shall not be thrown down; See Gill on Mat 24:2.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“One stone upon another - This was literally fulfilled. See Mat 24:2.”
1849
A.D.
1774–1849
“It was by the divine dispensation of Providence that this city and temple were destroyed; for had the ancient rites and sacrifices continued, some that were but weak in their faith, might have been filled with astonishment at the sight of these different modes of worship, existing at the same time, and thus have been lead astray from the path of truth. (Ven. Bede)”
Source
1863
A.D.
1796–1863
“Matt. xxiv. 2. Mark xiii. 2. Supra xix. 44. Of them not a stone would remain. The sentence is elliptical.”
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.