Book excerpt: Hazrat Abu Bakr Al-Siddiq (R.A) became the first caliph of the Muslims after the death of the Prophet (S.A.S). He was a close Companion of the Prophet (S.A.S); therefore, he became the first adult Muslim to believe in the revelation. As a wealthy trader, he supported the Prophet’s (S.A.S) mission in the early years by freeing slaves their masters mistreated for accepting Islam. The Prophet (S.A.S) gave him the title Al-Siddiq for his truthfulness and love for Allah and His Messenger. This book discusses Abu Bakr’s (R.A.) life and kingdom. This book is divided into three parts. The first part confers his life in Mecca. It details his early life, his relationship with the Messenger of Allah, his conversion to Islam, and his persecution after his conversion. The second part of looks at his life in Medina after migration. It sheds light upon his contribution to Medina. He played an active role in the military expedition with the Prophet (S.A.S). The third and final part is about the Caliphate, which lasted two years. Within a short span of two years, he unified the Muslims and expanded Islam to the furthest lands.