Abu Raja' al-Utaridi narrates: Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) used to teach us the Qur'an. He would seat us in circles, and he wore two white garments. When he recited this surah: "Read in the name of your Lord who created", Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) said: This verse was the first to be revealed to Sayyiduna Muhammad (peace and blessings be upon him).
Al-Tabarani recorded it, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التفسير / 11502