وَعَنْ أَنَسِ بْنِ مَالِكٍ رضى الله عنه
«أَنَّ رَسُولَ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَنَتَ شَهْرًا بَعْدَ اَلرُّكُوعِ، يَدْعُو عَلَى أَحْيَاءٍ مِنْ أَحْيَاءِ اَلْعَرَبِ، ثُمَّ تَرَكَهُ» مُتَّفَقٌ عَلَيْهِ. 11 صحيح
The Prophet (sallallahu alayhi wa sallam) recited Qunut (supplication in the prayer) for one month after (rising up from the) bowing (position), invoking curse on some Arab tribes. Afterwards, he gave it up.
Bulugh al-Maram 366, Book 2, The Book of Prayer, Hadith 187. 1 min read