Narrated Asim Al-Ahwal:

I asked Anas bin Malik regarding Al-Qunut during the prayer. Anas replied, "Yes (Al-Qunut was said by the Prophet in the prayer)." I said, "Is it before Bowing or after Bowing?" Anas replied, "(It was said) before (Bowing)." I said, "So-and-so informed me that you told him that it was said after Bowing." Anas replied, "He was mistaken, for Allah's Apostle ﷺ said Al-Qunut after Bowing for one month. The Prophet had sent some people called Al-Qurra who were seventy in number, to some pagan people who had concluded a peace treaty with Allah's Apostle . But those who had concluded the treaty with Allah's Apostle violated the treaty (and martyred all the seventy men). So Allah's Apostle ﷺ said Al-Qunut after Bowing (in the prayer) for one month, invoking evil upon them.

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا عَبْدُ الْوَاحِدِ، حَدَّثَنَا عَاصِمٌ الأَحْوَلُ، قَالَ سَأَلْتُ أَنَسَ بْنَ مَالِكٍ ـ رضى الله عنه ـ عَنِ الْقُنُوتِ، فِي الصَّلاَةِ فَقَالَ نَعَمْ. فَقُلْتُ كَانَ قَبْلَ الرُّكُوعِ أَوْ بَعْدَهُ قَالَ قَبْلَهُ. قُلْتُ فَإِنَّ فُلاَنًا أَخْبَرَنِي عَنْكَ أَنَّكَ قُلْتَ بَعْدَهُ، قَالَ كَذَبَ إِنَّمَا قَنَتَ رَسُولُ اللَّهِ ﷺ بَعْدَ الرُّكُوعِ شَهْرًا، أَنَّهُ كَانَ بَعَثَ نَاسًا يُقَالُ لَهُمُ الْقُرَّاءُ، وَهُمْ سَبْعُونَ رَجُلاً إِلَى نَاسٍ مِنَ الْمُشْرِكِينَ، وَبَيْنَهُمْ وَبَيْنَ رَسُولِ اللَّهِ ﷺ عَهْدٌ قِبَلَهُمْ، فَظَهَرَ هَؤُلاَءِ الَّذِينَ كَانَ بَيْنَهُمْ وَبَيْنَ رَسُولِ اللَّهِ ﷺ عَهْدٌ، فَقَنَتَ رَسُولُ اللَّهِ ﷺ بَعْدَ الرُّكُوعِ شَهْرًا يَدْعُو عَلَيْهِمْ.