Ibn Taymiyyah said:"The declaration of faith requires you to love only for the sake of Allah,to hate only for the sake of Allah, to ally yourself only for the sake of Allah, to declare enmity only for the sake of Allah; it requires you love what
Allah loves and to hate what Allah hates."
22. You (O Muhammad) will not find any people who believe in Allah and the Last Day, making friendship with those whooppose Allah and His Messenger (Muhammad), even though they were their fathers,or their sons, or their brothers, or their kindred (people). For such He has written Faith in their hearts, and strengthened them with Ruh (proofs,light and true guidance) from Himself. And We will admit them to Gardens(Paradise) under which rivers flow, to dwell therein (forever). Allah is pleased with them, and they with Him. They are the Party of Allah. Verily, it is the Party of Allah that will be the successful. (Surah Al-Muja'dilah)
4. Indeed there has been an excellent example for you in Ibrahim (Abraham) and those with him, when they said to their people: "Verily, we are free from you and whatever you worship besides Allah, we have rejected you, and there has started between us and you, hostility and hatred for ever, until you believe in Allah Alone," except the saying of Ibrahim (Abraham) to his father:"Verily, I will ask for forgiveness (from Allah) for you, but I have no power to do anything for you before Allah ." Our Lord! In You (Alone) we put our trust, and to You (Alone) we turn in repentance, and to You (Alone) is(our) final Return. (Surah Al-Muntahinah)
1. O you who believe! Take not My enemies and your enemies(i.e. disbelievers and polytheists, etc.) as friends, showing affection towards them, while they have disbelieved in what has come to you of the truth (i.e.Islamic Monotheism, this Qur'an, and Muhammad.) (Surah Al-Mumtahinah)
Ibn Taymiyah said:"The obligation of the believer is to choose both his friends and his enemies for the sake of Allah. Whenever there are believers, he must ally himself with them, even if they have wronged him, since no personal offense can absorb one of the obligations of alliance and faith. Allah has said:
9. And if two parties or groups among the believers fall to fighting, then make peace between them both, but if one of them rebels against the other, then fight you (all) against the one that which rebels till it complies with the Command of Allah; then if it complies, then make reconciliation between them justly, and be equitable. Verily! Allah loves those who are equitable.
10. The believers are nothing else than brothers (in Islamic religion). So make reconciliation between your brothers, and fear Allah, that you may receive mercy. (SurahAl-Hujurat)
"Allah has made them brothers, despite their fighting and rebellion towards one another, and has commanded their reconciliation. So the believer should reflect upon the fact that he owes his loyalty to his brother, even if he has one been wronged by him or finds that he is his adversary and that the disbeliever is his enemy,even if he is kindly treated by him and respected. Allah sent His Messengers and revealed His Books in order that all religion should be devoted to Him,alone; therefore, love should only be for those who are loyal to Him and anger for His enemies. Respect and honor are for His friends, while degradation and humiliation are for His foes. This explains the behavior of the first generations of Muslims who, despite their fighting with one another, allied themselves together in religion, it did not oppose one another in the same way that they opposed the disbelievers. They accepted one another's testimony,intermarried and inherited from each other. They acted with one another as Muslims even though the fight each other, scorned one another and more."