Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) said: The first of the Companions of the Messenger of Allah (peace and blessings be upon him) to come to us (that is, in Madinah) were Mus'ab bin Umayr and Ibn Umm Maktum (may Allah be pleased with them both). Both of them used to teach the Qur'an. Then Ammar bin Yasir, Bilal and Sa'd (may Allah be pleased with them) came. Then Umar bin al-Khattab (may Allah be pleased with him) came with twenty of the Companions of the Messenger of Allah (peace and blessings be upon him). Then the Messenger of Allah (peace and blessings be upon him) arrived, and the people of Madinah rejoiced so much that I had never seen them so happy before, until I saw boys and children running through the streets of Madinah, calling out: "The Messenger of Allah (peace and blessings be upon him) has come." By the time he (peace and blessings be upon him) arrived in Madinah, I had recited "Glorify the name of your Lord, the Most High" [Surah al-A'la: 1] and Mufassal surahs like it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17738