Al-Isra' - 17:5

فَإِذَا جَاء وَعْدُ أُولاهُمَا بَعَثْنَا عَلَيْكُمْ عِبَادًا لَّنَا أُوْلِي بَأْسٍ شَدِيدٍ فَجَاسُواْ خِلاَلَ الدِّيَارِ وَكَانَ وَعْدًا مَّفْعُولاً
[17:5]
So when the promise for the first of the two came, We sent over you Our servants, of mighty prowess, so they went to and fro among the houses, and it was a promise to be accomplished.
When the first of the warnings came to pass, We sent against you Our servants given to terrible warfare: They entered the very inmost parts of your homes; and it was a warning (completely) fulfilled.
So when the time for the first of the two came, We roused against you slaves of Ours of great might who ravaged (your) country, and it was a threat performed.