Tafseer Ibn Kathir of MUHAMMAD [21]

طَاعَةٌ وَقَوْلٌ مَّعْرُوفٌ فَإِذَا عَزَمَ الْأَمْرُ فَلَوْ صَدَقُوا اللَّهَ لَكَانَ خَيْرًا لَّهُمْ

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.