The word(s) "تَأْسَ" appears in 4 verse(s) in Quran.

(1) قَالَ فَإِنَّهَا مُحَرَّمَةٌ عَلَيْهِمْ ۛ أَرْبَعِينَ سَنَةً ۛ يَتِيهُونَ فِي الْأَرْضِ ۚ فَلَا تَأْسَ عَلَى الْقَوْمِ الْفَاسِقِينَ

(سورة المائدة, Al-Maaida, Chapter #5, Verse #26)
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(2) قُلْ يَا أَهْلَ الْكِتَابِ لَسْتُمْ عَلَىٰ شَيْءٍ حَتَّىٰ تُقِيمُوا التَّوْرَاةَ وَالْإِنجِيلَ وَمَا أُنزِلَ إِلَيْكُم مِّن رَّبِّكُمْ ۗ وَلَيَزِيدَنَّ كَثِيرًا مِّنْهُم مَّا أُنزِلَ إِلَيْكَ مِن رَّبِّكَ طُغْيَانًا وَكُفْرًا ۖ فَلَا تَأْسَ عَلَى الْقَوْمِ الْكَافِرِينَ

(سورة المائدة, Al-Maaida, Chapter #5, Verse #68)
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(3) وَأَنزَلَ الَّذِينَ ظَاهَرُوهُم مِّنْ أَهْلِ الْكِتَابِ مِن صَيَاصِيهِمْ وَقَذَفَ فِي قُلُوبِهِمُ الرُّعْبَ فَرِيقًا تَقْتُلُونَ وَتَأْسِرُونَ فَرِيقًا

(سورة الأحزاب, Al-Ahzaab, Chapter #33, Verse #26)
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(4) لِّكَيْلَا تَأْسَوْا عَلَىٰ مَا فَاتَكُمْ وَلَا تَفْرَحُوا بِمَا آتَاكُمْ ۗ وَاللَّهُ لَا يُحِبُّ كُلَّ مُخْتَالٍ فَخُورٍ

(سورة الحديد, Al-Hadid, Chapter #57, Verse #23)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)