Hadith 3660
Narrated `Ammar: I saw Allah's Apostle and there was none with him but five slaves, two women and Abu Bakr (i.e. those were the only converts to Islam then).
Hadith 3857
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.