﴿ كَلَّا لَئِن لَّمْ يَنتَهِ لَنَسْفَعًۢا بِٱلنَّاصِيَةِ ﴾

“Nay, if he desist not, We shall most surely drag him down upon his forehead”

Verse [ 15 - concluding part ] لَنَسْفَعًا بِالنَّاصِيَةِ (...We will certainly drag [ him ] by forelock.) The nasfa'an is derived from the infinitive safuun which means 'to seize and drag' and the word nasiyah means 'forelock', that is, the front part of a person's hair that falls forward over the forehead. When a person's forelock is seized, he becomes helpless in the hands of the seizer.