كُتِبَ عَلَيْكُمُ الْقِتَالُ وَهُوَ كُرْهٌ لَّكُمْ وَعَسَى أَن تَكْرَهُواْ شَيْئًا وَهُوَ خَيْرٌ لَّكُمْ وَعَسَى أَن تُحِبُّواْ شَيْئًا وَهُوَ شَرٌّ لَّكُمْ وَاللّهُ يَعْلَمُ وَأَنتُمْ لاَ تَعْلَمُونَ
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سورة البقرة
(2/216) War is enjoined on you, even though it be disliked by you; and it may be that you dislike a thing and it is actually good for you and it may be that you love a thing and it is actually bad for you. And Allah knows while you do not know.
Surah Al-Baqarah