Surah Al-Kawthar 108:3

إِنَّ شَانِئَكَ هُوَ ٱلْأَبْتَرُ

Indeed, your enemy is the one cut off.

Translation: Saheeh International

Tafsir

Indeed it is your antagonist your hater who is the severed one refraining from all acts of good or the one whose line of offspring will be severed by his not having any this was revealed regarding al-‘Āsī b. Wā’il who called the Prophet s al-abtar ‘the severed one’ when his son al-Qāsim died.

Excerpt from Tafsir al-Jalalayn, commentary on 108:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.