Volume 5 · Book 58 · Hadith 197
Narrated 'Ammar bin Yasir: I saw Allah's Apostle , and the only converts (to Islam) with him, were five slaves, two women and Abu Bakr.
— Sahih Bukhari, Volume 5, Book 58: Merits of the Helpers in Madinah (Ansaar), Hadith #197