Know that I have seen a book written by one of the scholars on the names of those about whom Qur’an was revealed but it was not accurate or comprehensive, so I composed on that subject a copious, comprehensive and accurate book and I excerpt from it here that wbich pertains to as-Siddiq, may Allah be pleased with him.

Allah, exalted is He, says, "The second of the two when the two of them were in the cave, when he said to his companion, “Do not be sad, truly Allah is with us. ” So Allah sent down His tranquillity upon him.’ (Qur’an 9: 40) The Muslims are unanimously agreed that the companion who is mentioned here is Abu Bakr, and there will come a tradition from him on it.

Ibn Abi Hatim narrated that Ibn cAbbas said, about His words, exalted is He, ' Then Allah sent down His tranquillity upon him,’ he said, ‘upon Abu Bakr. (As for) the Prophet, may Allah bless him and grant him peace, tranquillity was always upon him.’ Ibn Abi Hatim narrated that Ibn Mascud said that Abu Bakr bought Bilal from Umayyah ibn Khalf and Ubayy ibn Khalf with a cloak and ten pieces of silver (approximately an ounce each), then set him free for the sake of Allah. Then Allah revealed, "By the night when it covers... ’ up to His words, ‘... truly your endeavours are different,’ () meaning the endeavours of Abu Bakr, Umayyah and Ubayy.