Meaning, do not befriend the deniers, even if they are among the closest relatives. You will not find any people who believe in Allah and the Last Day, making friendship with those who oppose Allah and His Messenger, even though they were their fathers or their sons or their brothers or their kindred. Assuredly it is God's confederates who are the successful, the winners. Those are God's confederates, following His command and refraining from what He has forbidden. those, the ones who are not loving of them, He has inscribed, He has established, faith upon their hearts and reinforced them with a spirit, a light, from Him, exalted be He, and He will admit them into gardens underneath which rivers flow, wherein they will abide, God being pleased with them, for their obedience of Him, and they being pleased with Him, because of His reward. You will not find a people who believe in God and the Last Day loving, befriending, those who oppose God and His Messenger, even though they, the opposers, were their fathers, that is to say, the believers', or their sons or their brothers or their clan, rather they intend to do them harm and they fight them over faith, as occurred on one occasion with some Companions, may God be pleased with them.

Surah al mujadilah