In Surah Al-Qiyamah, he refers to the Day of Judgment, which was mentioned in all religions before Islam. But he uses this extremely small and important point in verses 3 and 4 of Surah Al-Qiyamah.
Al-Qiyamah
أَيَحۡسَبُ ٱلۡإِنسَٰنُ أَلَّن نَّجۡمَعَ عِظَامَهُۥ (3)
Does man think that We cannot reassemble his bones?
بَلَىٰ قَٰدِرِينَ عَلَىٰٓ أَن نُّسَوِّيَ بَنَانَهُۥ (4)
In fact, We are able to restore even his very fingertips.
 
As you can see, in verse 3, he says man, not humans, meaning the bones of each individual, and in verse 4, he refers to the fingerprints, which are still unique and no human being has the same fingerprint as another.
Most importantly, fingerprints have been discovered and are being used in recent decades. While the Creator of the universe told this to the people of that time 1400 years ago.​​​​​​​