وَلَوْ نَشَاءُ لَأَرَيْنَاكَهُمْ فَلَعَرَفْتَهُمْ بِسِيمَاهُمْ ۚ وَلَتَعْرِفَنَّهُمْ فِي لَحْنِ الْقَوْلِ ۚ وَاللَّهُ يَعْلَمُ أَعْمَالَكُمْ 30
Had We so wiled, We could have shown them up to thee, and thou shouldst have known them by their marks: but surely thou wilt know them by the tone of their speech! And Allah knows all that ye do.