وَلَا عَيْبَ فِيهِمْ غَيْرَ أَنَّ سُيُوفَهُمْ بِهِنَّ فُلُولٌ مِنْ قِرَاعِ الْكَتَائِبِ
They have no defect except that battle has notched their swords.
The exception creates an expectation of criticism, but battle-notched swords indicate martial courage. The apparent opening for blame strengthens praise.
The cause of the notches—repeated combat—is essential to the favorable evaluation.