Sahih al-Bukhari, Book 64, Hadith 133 (In-Book) ⓘ
Narrated Anas: Allah's Messenger said Al-Qunut for one month after the posture of Bowing, invoking evil upon some 'Arab tribes.
حَدَّثَنَا مُسْلِمٌ، حَدَّثَنَا هِشَامٌ، حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسٍ، قَالَ قَنَتَ رَسُولُ اللَّهِ صلى الله عليه وسلم شَهْرًا بَعْدَ الرُّكُوعِ يَدْعُو عَلَى أَحْيَاءٍ مِنَ الْعَرَبِ.
also referenced under: Hadith 4089 (DarusSalam) & Volume 5, Book 59, Hadith 415 (USC-MSA)