This application (Off Line) contains the story of the caliph of Islam, Abu Bakr As-Siddiq, Umar bin Al-Khattab Al-Faruq, Uthman Dhun-Nurayn, Ali bin Abi Talib and also contains a story 10 Companions of the Prophet Muhammad are promised Paradise. meaning of caliphs word 'Caliph' is the English form of the Arabic word 'Khalifa,' which is short for Khalifatu Rasulil-lah. The latter expression means Successor to the Messenger of God, the Holy Prophet Muhammad (peace be on him). The title 'Khalifatu Rasulil-lah'. was first used for Abu Bakr, who was elected head of the Muslim community after the death of the Prophet.