Anas b. Malik reported that the Messenger of Allah ﷺ observed Qunut for a month in the dawn prayer after ruku' and invoked curse upon Bani Usayya.
أَنَّ رَسُولَ اللَّهِ ﷺ قَنَتَ شَهْرًا بَعْدَ الرُّكُوعِ فِي صَلاَةِ الْفَجْرِ يَدْعُو عَلَى بَنِي عُصَيَّةَ