Fath al-Rabbani

It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with him) that when the Messenger of Allah (peace and blessings be upon him) entered Makkah in the year of the conquest of Makkah, he stood among the people to deliver a sermon and said: O people! The agreements made before Islam, by which the parties would help each other, Islam further strengthens such agreements. However, now in Islam, there is no need for any new agreement that we are allies of each other and will continue to help each other. In another narration, it is stated: Do not make any such new agreement in Islam. In another narration, it is also mentioned that after the conquest of Makkah, migration from here is no longer permissible, and all Muslims are like one hand against the disbelievers, and the blood (i.e., sanctity) of all of them is equal. If even the lowest-ranking Muslim grants protection to an enemy, it will be considered as granted by all Muslims, and the spoils of war obtained in jihad will be distributed among the Muslims, even if they are very far away, and the prisoners of jihad will also be distributed among those who remained at home and could not practically participate in the battlefield. No believer can be killed in exchange for a disbeliever, the blood money for a disbeliever is half that of a Muslim, and if a Muslim government official goes to collect zakat, it is not permissible for him to stay in one place and tell the people to bring all their animals to him so that he may calculate and collect zakat from them, as this would cause hardship for the people. Nor is it permissible for the government official to go to the residences of the people to collect zakat so that they may avoid zakat by moving here and there. Zakat should be collected from the people at their homes or places of residence.