Sayyiduna Ali (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) used to recite on the minbar Surah al-Kafirun and Surah al-Ikhlas.
Imam al-Tabarani recorded it in al-Mu'jam al-Awsat; he says: Ishaq bin Zurayq is alone in narrating it. (Allamah al-Haythami says:) I say: I have not found anyone who has given an account of him, and the remaining narrators of this narration have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 3156