نَّذْر
Appears 2 times in the Quran.
(Root: نذر)
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2:270 وَمَآ أَنفَقْتُم مِّن نَّفَقَةٍ أَوْ نَذَرْتُم مِّن نَّذْرٍ فَإِنَّ ٱللَّهَ يَعْلَمُهُۥ وَمَا لِلظَّٰلِمِينَ مِنْ أَنصَارٍ
And whatever alms you give or (whatever) vow you vow, surely Allah knows it; and the unjust shall have no helpers.
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They fulfill vows and fear a day the evil of which shall be spreading far and wide.