تَنسَوْنَ
Appears 2 times in the Quran.
(Root: نسي)
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2:44 أَتَأْمُرُونَ ٱلنَّاسَ بِٱلْبِرِّ وَتَنسَوْنَ أَنفُسَكُمْ وَأَنتُمْ تَتْلُونَ ٱلْكِتَٰبَ أَفَلَا تَعْقِلُونَ
What! do you enjoin men to be good and neglect your own souls while you read the Book; have you then no sense?
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6:41 بَلْ إِيَّاهُ تَدْعُونَ فَيَكْشِفُ مَا تَدْعُونَ إِلَيْهِ إِن شَآءَ وَتَنسَوْنَ مَا تُشْرِكُونَ
Nay, Him you call upon, so He clears away that for which you pray if He pleases and you forget what you set up (with Him).