اقرأ وتدبر الآية 4575 من سورة سُورَةُ مُحَمَّدٍ: وَلَوْ نَشَاءُ لَأَرَيْنَاكَهُمْ فَلَعَرَفْتَهُمْ بِسِيمَاهُمْ ۚ وَلَتَعْرِفَنَّهُمْ فِي لَحْنِ الْقَوْلِ ۚ وَاللَّهُ يَعْلَمُ أَعْمَالَكُمْ
وَلَوْ نَشَاءُ لَأَرَيْنَاكَهُمْ فَلَعَرَفْتَهُمْ بِسِيمَاهُمْ ۚ وَلَتَعْرِفَنَّهُمْ فِي لَحْنِ الْقَوْلِ ۚ وَاللَّهُ يَعْلَمُ أَعْمَالَكُمْ
Now had We so willed, We could have shown them clearly to thee, so that thou wouldst know them for sure as by a visible mark: but [even so,] thou wilt most certainly recognize them by the tone of their voice. And God knows all that you do, [O men;]