John Gill Commentary Daniel 9:12

"And he hath confirmed his words, which he spake against us, and against our judges that judged us, by bringing upon us a great evil; for under the whole heaven hath not been done as hath been done upon Jerusalem." — Daniel 9:12 (ASV)

And he has confirmed his words which he spoke against us. That is, he has made good his threatenings of wrath and vengeance, in case of disobedience to his law:

and against our judges that judged us; kings, and inferior governors, that ruled over them, who perverted justice, and did not execute righteous judgment; and against them the Lord performed what he threatened:

by bringing upon us a great evil; the desolation of the whole land, the destruction of Jerusalem; the death of many by the sword, famine, and pestilence, and the captivity of the rest; all which was a great punishment considered in itself, but, when compared with their offences, was less than they deserved:

for under the whole heaven has not been done as has been done upon Jerusalem; its walls broken down, its houses burnt with fire, even the palaces of the king and nobles, and the temple of the Lord itself; and all its inhabitants destroyed, dispersed, or carried captive; see (Lamentations 1:12) (Ezekiel 5:9Ezekiel 5:10) .