خَلَا
Appears 2 times in the Quran.
(Root: خلو)
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2:76 وَإِذَا لَقُوا۟ ٱلَّذِينَ ءَامَنُوا۟ قَالُوٓا۟ ءَامَنَّا وَإِذَا خَلَا بَعْضُهُمْ إِلَىٰ بَعْضٍ قَالُوٓا۟ أَتُحَدِّثُونَهُم بِمَا فَتَحَ ٱللَّهُ عَلَيْكُمْ لِيُحَآجُّوكُم بِهِۦ عِندَ رَبِّكُمْ أَفَلَا تَعْقِلُونَ
And when they meet those who believe they say: We believe, and when they are alone one with another they say: Do you talk to them of what Allah has disclosed to you that they may contend with you by this before your Lord? Do you not then understand?
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35:24 إِنَّآ أَرْسَلْنَٰكَ بِٱلْحَقِّ بَشِيرًا وَنَذِيرًا وَإِن مِّنْ أُمَّةٍ إِلَّا خَلَا فِيهَا نَذِيرٌ
Surely We have sent you with the truth as a bearer of good news and a warner; and there is not a people but a warner has gone among them.