وَيْلكُمْ
Appears 2 times in the Quran.
(No Root)
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20:61 قَالَ لَهُم مُّوسَىٰ وَيْلَكُمْ لَا تَفْتَرُوا۟ عَلَى ٱللَّهِ كَذِبًا فَيُسْحِتَكُم بِعَذَابٍ وَقَدْ خَابَ مَنِ ٱفْتَرَىٰ
Musa said to them: Woe to you! do not forge a lie against Allah, lest He destroy you by a punishment, and he who forges (a lie) indeed fails to attain (his desire).
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28:80 وَقَالَ ٱلَّذِينَ أُوتُوا۟ ٱلْعِلْمَ وَيْلَكُمْ ثَوَابُ ٱللَّهِ خَيْرٌ لِّمَنْ ءَامَنَ وَعَمِلَ صَٰلِحًا وَلَا يُلَقَّىٰهَآ إِلَّا ٱلصَّٰبِرُونَ
And those who were given the knowledge said: Woe to you! Allah's reward is better for him who believes and does good, and none is made to receive this except the patient.