Sura 47 Muhammad, ayah 21

1. طَاعَةٌ وَقَوْلٌ مَعْرُوفٌ ۚ فَإِذَا عَزَمَ الْأَمْرُ فَلَوْ صَدَقُوا اللَّهَ لَكَانَ خَيْرًا لَهُمْ

   Obedience and good words. And when the matter (of fighting) was determined, if they had been true to Allah, it would have been better for them.

   47:21

Translation: Saheeh International