يُعْرَفُ الْمُجْرِمُونَ بِسِيمَاهُمْ فَيُؤْخَذُ بِالنَّوَاصِي وَالْأَقْدَامِ (The guilty ones will be recognized [ by the angels ] by their marks and will be seized by foreheads and feet...55:41). The word sima means 'a sign'. Hasan Basri (رح) says that the day when sentence will be passed against the guilty to go to Hell, the following will be their signs: They will be known by their dark faces and their blue eyes. Through grief their faces will turn pale. The angels will recognize the guilty by these signs and seize them.
The word نَّوَاصِي nawasi is the plural of نَاصِیۃُ nasiyah, and means 'forelock'. Some will be dragged by their forelocks, and others will be dragged by their feet. Or it could mean that sometimes they will be dragged by their forelocks and at other times they will be dragged by their feet. The third explanation could be that the angels of punishment will bend their foreheads down to their feet and tie the forelocks to the feet, and throw them into the Hellfire. Allah knows best!
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 36–44
The present world is a place of trial. So long as the period of testing lasts, everybody has the opportunity to be as arrogant as he pleases. But, in spite of this complete freedom, no jinn or human being has the power to go beyond the limits of the universe. This fact itself is enough to prove that man is completely in the grip of God. On the expiry of the test period, when He starts seizing hold of people, it will not be possible for anybody to save himself.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.