If we will, we can expose them for you, so that you can recognize them just by looking at them. However, you can recognize them by the way they talk. God is fully aware of all your works.
وَلَو نَشاءُ لَأَرَينٰكَهُم فَلَعَرَفتَهُم بِسيمٰهُم وَلَتَعرِفَنَّهُم فى لَحنِ القَولِ وَاللَّهُ يَعلَمُ أَعمٰلَكُم
wa law nashaaa’u la-arainaakahum fala ‘araftahum bi seemaahum; wa lata’rifan nahum fee lahnil qawl; wallaahu ya’lamu a’maalakum