8.72 . Lo! those who believed and left their homes and strove with their wealth and their lives for the cause of Allah , and those who took them in and helped them ; these are protecting friends one of another . And those who believed but did not leave their homes , ye have no duty to protect them till they leave their homes ; but if they seek help from you in the matter of religion then it is your duty to help ( them ) except against a folk between whom and you there is a treaty . Allah is Seer of what ye do .
Translation of Sahih Bukhari: Translator: M. Muhsin Khan
Sahih Bukhari is a collection of sayings and deeds of Prophet Muhammad (pbuh),
also known as the sunnah. The reports of the Prophet's sayings and deeds are called ahadith.
Bukhari lived a couple of centuries after the Prophet's death and worked extremely hard to collect his ahadith.
Each report in his collection was checked for compatibility with the Qur'an, and the veracity of the chain of reporters had to be painstakingly established.
Bukhari's collection is recognized by the overwhelming majority of the Muslim world to be one of the most authentic collections of the Sunnah of the Prophet (pbuh).