On raising his head from bowing in the final Rak‘ah of the Fajr prayer, he would say: O Allah, curse so-and-so and so-and-so, after saying: "Allah hears those who praise Him, our Lord, all praise belongs to You." So, Allah revealed: {Not for you is the decision}

عن عبد الله بن عمر رضي الله عنهما أنه سمع رسول الله صلى الله عليه وسلم يقول: إذا رَفَعَ رَأْسَه مِن الرُّكوع في الركعة الأخيرة مِن الفَجْر: «اللهمَّ الْعَنْ فُلانًا وفُلانًا». بعدَما يقول: «سَمِعَ الله لمن حَمِدَه رَبَّنا ولك الحَمْدُ». فأنزل الله: (لَيْسَ لَكَ مِنَ الأَمْرِ شَيْءٌ ...) الآية. وفي رواية: يَدْعُو على صَفْوَانَ بنِ أُمَيَّةَ، وسُهيْلِ بن عَمْرٍو، والحارث بن هشام، فنَزَلَتْ: (لَيْسَ لَكَ مِنَ الأَمْرِ شَيْءٌ).

‘Abdullāh ibn ‘Umar (may Allah be pleased with him) reported that he heard the Messenger of Allah (may Allah's peace and blessings be upon him) on raising his head from bowing in the final Rak‘ah of the Fajr prayer, say: "O Allah, curse so-and-so and so-and-so", after saying: "Allah hears those who praise Him, our Lord, all praise belongs to You." So, Allah revealed: {Not for you (O Muhammad) is the decision.} [Sūrat āl-‘Imrān: 128] According to another narration of the Hadīth: "He was invoking against Safwān ibn Umayyah, Suhayl ibn ‘Amr, and Al-Hārith ibn Hishām, so the following verse was revealed: {Not for you (O Muhammad) is the decision.} [Sūrat āl-‘Imrān: 128]

Source · Narrated by Bukhari

From the Hadith Encyclopedia (hadeethenc.com).