It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) set out from Madinah Munawwarah on the tenth of Ramadan in the year of the conquest of Makkah, and when he reached Marr az-Zahran, he broke his fast.
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2882
Hadith Gradingحکم دارالسلام:حديث صحيح دون قوله: مر الظهران