(5) باب قَوْلِ النَّبِيِّ صلى الله عليه وسلم " لَوْ كُنْتُ مُتَّخِذًا خَلِيلاً " قَالَهُ أَبُو سَعِيدٍ
Narrated `Ammar:
I saw Allah's Messenger (ﷺ) and there was none with him but five slaves, two women and Abu Bakr (i.e. those were the only converts to Islam then).
Reference: Sahih al-Bukhari 3660
In-book reference: Book 62, Hadith 12
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 57, Hadith 12