Salim narrates from his father, Abdullah bin Umar (may Allah be pleased with them both), that he heard the Prophet (peace and blessings be upon him), after raising his head from ruku' in the second rak'ah of Fajr, make this supplication: 'Allahumma-l'an fulanan wa fulanan' (O Allah, send Your curse upon so-and-so and so-and-so). Then Allah Almighty revealed this verse: "You have no say at all in the matter" [Surah Al Imran: 128].
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3093