Who accepted Islam first among men? 

1. Hazrat Ali
2. Hazrat Abu Bakr
3. Hazrat Usman
4. Hazrat Umar

Hazrat Abu Bakr Siddiq (R.A.) was the first adult male convert, accepting Islam immediately after Khadija (R.A.). As the Prophet’s closest friend, he used his wealth and influence to free slaves like Bilal (R.A.). Sunni sources (Sahih al-Bukhari 3662) highlight his unwavering faith during the Isra and Mi’raj, earning him “As-Siddiq” (The Truthful). His daughter Aisha (R.A.) later became the Prophet’s wife, further cementing his status.