Quran

 2:216

كُتِبَ عَلَيْكُمُ الْقِتَالُ وَهُوَ كُرْهٌ لَكُمْ ۖ وَعَسَىٰ أَنْ تَكْرَهُوا شَيْئًا وَهُوَ خَيْرٌ لَكُمْ ۖ وَعَسَىٰ أَنْ تُحِبُّوا شَيْئًا وَهُوَ شَرٌّ لَكُمْ ۗ وَاللَّهُ يَعْلَمُ وَأَنْتُمْ لَا تَعْلَمُونَ ﴿٢١٦﴾

216. Fighting is ordained for you, even though you hate it. But it may be that you hate something while it is good for you, and it may be that you love something while it is bad for you. Allah knows, and you do not know.