(30) باب إِسْلاَمُ أَبِي بَكْرٍ الصِّدِّيقِ رضى الله عنه
Narrated `Ammar bin Yasir:
I saw Allah's Messenger (ﷺ) , and the only converts (to Islam) with him, were five slaves, two women and Abu Bakr.
Reference: Sahih al-Bukhari 3857
In-book reference: Book 63, Hadith 83
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 58, Hadith 197