The expression “if anyone has a cause for complaint ” suggests that there may be valid reasons for becoming irritated with others.
١٥ ‏ (‏ أ )‏ مَاذَا نَتَعَلَّمُ عَنِ ٱلْغُفْرَانِ مِنْ مِثَالِ أَيُّوبَ ؟‏