Sahih Bukhari Volume 5, Book 58, Hadith Number 262.

Narated By Al-Bara bin Azib : The first people who came to us (in Medina) were Mus’ab bin ‘Umar and Ibn Um Maktum who were teaching Qur’an to the people. Then their came Bilal. Sad and ‘Ammar bin Yasir. After that ‘Umar bin Al-Khattab came along with twenty other companions of the Prophet. Later on the Prophet himself (to Medina) and I had never seen the people of Medina so joyful as they were on the arrival of Allah’s Apostle, for even the slave girls were saying, “Allah’s Apostle has arrived!” And before his arrival I had read the Sura starting with: “Glorify the Name of your Lord, the Most High” (87.1) together with other Suras of Al-Mufassal.