We leave their hidden affairs to Allah the Exalted, and we do not deem it permissible to raise the sword against anyone from the community of Muhammad—peace and blessings be upon him. Rather, we think well of them, consign their inner secrets to Allah, and have not been instructed to probe into people and their conditions. What is required is to cover the Muslim’s faults, assume the best about him, and foster brotherhood among the Muslims. (1) “The believers are but brothers.” (Qur’an 49:10)
It is unlawful to kill a Muslim or regard his blood as permissible, for Allah has made him inviolable by virtue of Islam. The Prophet, peace and blessings be upon him, said: “I have been commanded to fight the people until they declare, ‘There is no god but Allah.’ When they do so, they protect their blood and their property from me—except for a right that is due—and their reckoning rests with Allah.” (2) Thus, anyone who outwardly manifests Islam, pronounces the two testimonies of faith, and has shown no nullifier of Islam, his blood is sacred; it is impermissible to assault him or shed his blood. The Prophet, peace and blessings be upon him, also said: “Your blood, your property, and your honour are sacred to you, like the sanctity—”