One of the Companions of the Prophet (peace and blessings be upon him), Sayyiduna al-Agharr (may Allah be pleased with him), relates: I prayed behind the Prophet (peace and blessings be upon him), and he recited Surah al-Rum.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2670