Anas reported that the Messenger of Allah ﷺ observed Qunut for one month invoking curse upon some tribes of Arabia (those who were responsible for the murders in Bi'r Ma'una and Raji'), but then abandoned it.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَنَتَ شَهْرًا يَدْعُو عَلَى أَحْيَاءٍ مِنْ أَحْيَاءِ الْعَرَبِ ثُمَّ تَرَكَهُ  

The Messenger of Allah ﷺ said the Qunut for one month, supplicating against one of the 'Arab tribes, then he stopped doing that."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَنَتَ شَهْرًا يَدْعُو عَلَى حَىٍّ مِنْ أَحْيَاءِ الْعَرَبِ ثُمَّ تَرَكَهُ  

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.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَقْنُتُ فِي صَلاَةِ الصُّبْحِ يَدْعُو عَلَى حَىٍّ مِنْ أَحْيَاءِ الْعَرَبِ شَهْرًا ثُمَّ تَرَكَ  

[Machine] The Messenger of Allah ﷺ spent a month praying against the living ones from the Arabs, specifically Ri`l, Bani Lihyan, `Usayyah, and Thaqwan, during the Fajr prayer.  

أَنَّ رَسُولَ اللهِ ﷺ قَنَتَ شَهْرًا يَدْعُو عَلَى أَحْيَاءٍ مِنَ الْعَرَبِ رِعْلٍ وَبَنِي لِحْيَانَ وَعُصَيَّةَ وَذَكْوَانَ فِي صَلَاةِ الصُّبْحِ  

"The Messenger of Allah ﷺ prayed (saying the) Qunut after bowing for a month, supplicating against Ri'l, Dhakwan and 'Usayyah who had disobeyed Allah and His Messenger." (Sahih). (Using translation from Nasāʾī 1070)   

«أَنَّ رَسُولَ اللَّهِ ﷺ قَنَتَ شَهْرًا بَعْدَ الرُّكُوعِ يَدْعُو عَلَى حَيٍّ مِنْ أَحْيَاءِ الْعَرَبِ رِعْلٍ وَذَكْوَانَ» وَقَالَ «عُصَيَّةٌ عَصَتِ اللَّهَ وَرَسُولَهُ»  

"قَنَتَ رَسُولُ الله ﷺ شَهْرًا فِى صلاَةِ الصُّبْح يَدْعُو عَلَى أحْيَاءَ مِنْ أحْيَاءِ العَرَبِ: عُصَيَّة، وَذَكْوان، وَرِعْل، وَلَحْيَان، وَكُلُّهُمْ مِنْ بَنِى سُلَيْمٍ".