وَعَنْهُ أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«كَانَ لَا يَقْنُتُ إِلَّا إِذَا دَعَا لِقَوْمٍ، أَوْ دَعَا عَلَى قَوْمٍ» صَحَّحَهُ اِبْنُ خُزَيْمَةَ. 11 صحيح
The Prophet (sallallahu alayhi wa sallam) never used to supplicate [i.e. Qunut in the prayer) except when he prayed for a people or when he prayed against a people.
Bulugh al-Maram 368, Book 2, The Book of Prayer, Hadith 189. 1 min read