كَانَت
Appears 4 times in the Quran.
(Root: كون)
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21:74 وَلُوطًا ءَاتَيْنَٰهُ حُكْمًا وَعِلْمًا وَنَجَّيْنَٰهُ مِنَ ٱلْقَرْيَةِ ٱلَّتِى كَانَت تَّعْمَلُ ٱلْخَبَٰٓئِثَ إِنَّهُمْ كَانُوا۟ قَوْمَ سَوْءٍ فَٰسِقِينَ
And (as for) Lut, We gave him wisdom and knowledge, and We delivered him from the town which wrought abominations; surely they were an evil people, transgressors;
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And what she worshipped besides Allah prevented her, surely she was of an unbelieving people.
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40:22 ذَٰلِكَ بِأَنَّهُمْ كَانَت تَّأْتِيهِمْ رُسُلُهُم بِٱلْبَيِّنَٰتِ فَكَفَرُوا۟ فَأَخَذَهُمُ ٱللَّهُ إِنَّهُۥ قَوِىٌّ شَدِيدُ ٱلْعِقَابِ
That was because there came to them their messengers with clear arguments, but they rejected (them), therefore Allah destroyed them; surely He is Strong, Severe in retribution.
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64:6 ذَٰلِكَ بِأَنَّهُۥ كَانَت تَّأْتِيهِمْ رُسُلُهُم بِٱلْبَيِّنَٰتِ فَقَالُوٓا۟ أَبَشَرٌ يَهْدُونَنَا فَكَفَرُوا۟ وَتَوَلَّوا۟ وَّٱسْتَغْنَى ٱللَّهُ وَٱللَّهُ غَنِىٌّ حَمِيدٌ
That is because there came to them their messengers with clear arguments, but they said: Shall mortals guide us? So they disbelieved and turned back, and Allah does not stand in need (of anything), and Allah is Self-sufficient, Praised.