Muhammad 47:30

Walaw nashao laaraynakahumfalaAAaraftahum biseemahum walataAArifannahum fee lahnialqawli wallahu yaAAlamu aAAmalakum

And if We willed, We could show them to you, and you would know them by their mark; but you will surely know them by the tone of [their] speech. And Allāh knows your deeds.

Had We willed, We would have shown them to you (by identifying each one of them,) so as you would definitely recognize them by their features. However, you will recognize them by the tone of (their) speech. And Allah knows (all) your deeds.