In “The History of Islam”, vol. 1, by Akbar Shah Najeebabadi and revised by Safi-ur-Rahman Mubarakpuri, it states on page 106:
“He started the task of keeping people away from polytheism and inviting to Tauhid right from his household, with the result that Khadijah radiAllaahu ‘anha was the first to embrace Islam. ‘Ali bin abu Talib radiAllaahu ‘anhu and Zaid bin Harithah radiAllaahu ‘anhu were also converted to Islam the very first day. These all belonged to his household. Abu Bakr bin abuQuhafah radiAllaahu ‘anhu who was the Prophet’s friend, accepted Islam the same day. Now, the individuals to become Muslims on the first day were his family members and his best friend. These were the people who knew the Prophet salAllaahu ‘alayhi wa salam well and were aware of his traits and character for a very long time, and no aspect of his life was a secret to them. Now, their embracing of Islam the very first day was an outstanding proof of his truthfulness and uprightness.” END QUOTE
The History of al-Tabari, volume VI, Muhammad at Mecca, cites a lot of reports with their chains of transmissions on this subject of who became the first Muslim after Khadijah; there are reports that ‘Ali is the first, there are reports that abu Bakr is the first and there are reports that Zaid is the first radiAllaahu ‘anhum.
The pages where these reports are listed are pages 80-86.
The first question of Fatwa no. 8808
Q 1: It is well-known that the first man to embrace Islam was Abu Bakr Al-Siddiq (may Allah be pleased with him).
However, we found it written in the third part of “Suwar min Hayat Al-Sahabah” [Glimpses of the Lives of the Prophet’s Companions], a textbook for the third grade of middle school students, that the first man to embrace Islam was Zayd ibn Harithah ibn Sharahil. Please tell us which of these two men was the first to embrace Islam and may Allah reward you!
A: The correct opinion is that the first to embrace Islam from the men was Abu Bakr (may Allah be pleased with him), from the women was Khadijah, from the boys was ‘Aly, and from the slaves were Zayd ibn Harithah and Bilal.
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.
The Permanent Committee for Scholarly Research and Ifta’
Member: ‘Abdullah ibn Qa’ud
Member: ‘Abdullah ibn Ghudayyan
Deputy Chairman: ‘Abdul-Razzaq ‘Afify
Chairman: ‘Abdul-‘Aziz ibn ‘Abdullah ibn Baz
Alle 114.000 Sahaba waren rechtvaardig:
Het totaal aantal vrienden van de Profeet salAllahu 3alayhi wa salam is 114.000 Sa7aaba
Source: من عاش من الصحابة ١٢٠ عاما تأليف الحافظ يحي بن مندة