• فَكّ
• مُنفَكِّين

Appears 2 times in the Quran.

1. 90:13 فَكُّ رَقَبَةٍ

   (It is) the setting free of a slave,
   

2. 98:1 لَمْ يَكُنِ ٱلَّذِينَ كَفَرُوا۟ مِنْ أَهْلِ ٱلْكِتَٰبِ وَٱلْمُشْرِكِينَ مُنفَكِّينَ حَتَّىٰ تَأْتِيَهُمُ ٱلْبَيِّنَةُ

   Those who disbelieved from among the followers of the Book and the polytheists could not have separated (from the faithful) until there had come to them the clear evidence: