loyalty and alliance (wala' and bara')

وَلَوْ كَانُوا۟ يُؤْمِنُونَ بِٱللَّهِ وَٱلنَّبِىِّ وَمَآ أُنزِلَ إِلَيْهِ مَا ٱتَّخَذُوهُمْ أَوْلِيَآءَ وَلَـٰكِنَّ كَثِيرًا مِّنْهُمْ فَـٰسِقُونَ

And if they had believed in Allāh and the Prophet and in what was revealed to him, they would not have taken them as allies; but many of them are defiantly disobedient.