Surah Al-Fajr 89:3

وَٱلشَّفْعِ وَٱلْوَتْرِ

And [by] the even [number] and the odd

Translation: Saheeh International

Tafsir

and by the even the pair and the odd read watr or witr two alternative forms the single

Excerpt from Tafsir al-Jalalayn, commentary on 89:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.