كَلَّا لَئِن لَّمْ يَنتَهِ لَنَسْفَعًۢا بِٱلنَّاصِيَةِ ١٥
Sentence structure
كَلَّا deters; لَئِن لَّمْ يَنتَهِ is an emphatic condition. لَنَسْفَعًۢا is its emphatic result and بِٱلنَّاصِيَةِ links to the verb.
Ayah summary
If he does not stop, he will be seized by the forelock.
كَلَّا — No indeed
Grammar: A deterrent and rebuke particle.
لَئِن — surely if
Grammar: لَ is oath-emphasis and إِنْ is conditional.
لَّمْ — does not
Grammar: A negative particle that jussivizes the following imperfect.
يَنتَهِ — he desists
Grammar: A Form VIII third-person masculine-singular imperfect, jussive after لَمْ, with understood subject.
لَنَسْفَعًۢا — We will surely seize
Grammar: لَ emphasizes; first-person-plural imperfect with emphatic light nūn and understood subject نَحْنُ.
بِٱلنَّاصِيَةِ — by the forelock
Grammar: بِ is a preposition; the defined feminine noun is genitive. This phrase is linked to «نَسْفَعًۢ».