Sunan Ibn Majah 1243
سنن ابن ماجه#1243Sahihحَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، حَدَّثَنَا هِشَامٌ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ كَانَ يَقْنُتُ فِي صَلاَةِ الصُّبْحِ. يَدْعُو عَلَى حَىٍّ مِنْ أَحْيَاءِ الْعَرَبِ، شَهْرًا. ثُمَّ تَرَكَ .
It was narrated from Anas bin Malik that the Messenger of Allah (ﷺ) used to recite Qunut in the Subh prayer, and he used to supplicate in it against one of the Arab tribes for a month, then he stopped doing so
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 5:441