Surah As-Saffat 37:20

وَقَالُوا۟ يَـٰوَيْلَنَا هَـٰذَا يَوْمُ ٱلدِّينِ

They will say, "O woe to us! This is the Day of Recompense."

Translation: Saheeh International

Tafsir

And they the disbelievers will say ‘O yā is for calling attention woe to us!’ O our destruction is here waylanā is a verbal noun without any regular verbal conjugation. And the angels will say to them ‘This is the Day of Retribution’ the Day of Reckoning and Requital.

Excerpt from Tafsir al-Jalalayn, commentary on 37:20, via Quran.com. The reader has the full commentary and 9 more tafsirs.