Surah At-Tariq 86:13
إِنَّهُۥ لَقَوْلٌ فَصْلٌ
Indeed, it [i.e., the Qur’ān] is a decisive statement,
Translation: Saheeh International
Tafsir
assuredly it the Qur’ān is a decisive word distinguishing between truth and falsehood
Excerpt from Tafsir al-Jalalayn, commentary on 86:13, via Quran.com. The reader has the full commentary and 9 more tafsirs.