من حقوق الله تعالى أن لا يمايل من المشركين ذا قربى ولا يحابي في نصرة دين الله ذا مودة فإن حق الله أوجبُ ونصرة دينه ألزم قال الله تعالى ﴿ يا أيها الذين آمنوا لا تتخذوا عدوي وعدوكم أولياء تُلقون اليهم بالمودة وقد كفروا بما جاءكم من ألحق ﴾ الآية
الأحكام السلطانية والولايات الدينية للماوردي الباب الرابع في تقليد الإمارة على الجهاد
It is part of duty to Allah Most High that one not be sympathetic to a relative from among the Idolaters, nor side with a friend while upholding the religion of Allah; indeed duty to Allah is more incumbent, and upholding His religion [deen] is more binding. Allah Most High has said: { Oh you who have believed! Do not take my enemy and your enemy as associates, extending friendship to them, as they have disbelieved in the truth that has come to you } [Al-mumtahana 1] and the rest of the verse.
Al-Mawardi, Ahkam Al-sultaniya wa Al-wilayat Al-diniyya [Sovereign Rulings and Religious Jurisdictions], Chapter 4: On appointing position of authority (an emirate) over jihad