Imam Ali (AS) said, Love for the sake of Allah the one who struggles against you for the betterment of [your] religion and covers you with the mantle of certitude.
الإمامُ عليٌّ (عَلَيهِ الّسَلامُ) : أحْبِبْ في اللّهِ مَنْ يُجاهِدُكَ على صَلاحِ دين وَ يُكْسِيكَ(يُكْسِبُكَ) حُسنَ يَقين