Narrated by Sayyiduna Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: The blood of the believers is equal among themselves, they are united in cooperation against their enemies, even the lowest-ranking Muslim has the right to the covenant of all Muslims. Beware! A believer will not be killed in retaliation for a disbeliever, and no dhimmi will be killed during his covenant.