[Assisting a Tribe that has Borne Financial Liabilities for Offences]

Answer – and Allah is the One who grants success: It is permissible to assist them in what has become due upon them of money, except if the assistance will lead them to persist in doing such an act. People still assist the deliberate killer in what is due from him of blood-money, and we have not heard any of the scholars denounce that. The Prophet (may Allah bless him and his family and grant them peace) undertook the blood-money of the Anṣārī who was killed in Khaybar, and the Commander of the Faithful (peace be upon him) undertook the blood-money of the one whom Hamdān killed with the hooves of its horses. There are many reports from numerous notable Arabs and Muslims telling that they would undertake the blood-monies on behalf of deliberate killers in order to calm the fitnah (sedition) among the people.

Source: Min Thimār al-ʿIlm wa al-Ḥikmah vol.2