﴿ فَٱخْتَلَفَ ٱلْأَحْزَابُ مِنۢ بَيْنِهِمْ ۖ فَوَيْلٌۭ لِّلَّذِينَ ظَلَمُوا۟ مِنْ عَذَابِ يَوْمٍ أَلِيمٍ ﴾

“But factions from among those [who came after Jesus] began to hold divergent views: woe, then, unto those who are bent on evildoing - [woe] for the suffering [that will befall them] on a grie­vous Day!”

But the factions differed among themselves regarding the status of Jesus was he God or the son of God or the third of Three deities? So woe waylun is a term implying chastisement to those who do wrong those who blaspheme in what they say about Jesus from the chastisement of a painful day.