• خَاتَم
• خَتَمَ
• خِتَٰمهُۥ
• مَّخْتُوم
• نَخْتِمُ
• يَخْتِمْ

Appears 8 times in the Quran.

1. 2:7 خَتَمَ ٱللَّهُ عَلَىٰ قُلُوبِهِمْ وَعَلَىٰ سَمْعِهِمْ وَعَلَىٰٓ أَبْصَٰرِهِمْ غِشَٰوَةٌ وَلَهُمْ عَذَابٌ عَظِيمٌ

   Allah has set a seal upon their hearts and upon their hearing and there is a covering over their eyes, and there is a great punishment for them.
   

2. 6:46 قُلْ أَرَءَيْتُمْ إِنْ أَخَذَ ٱللَّهُ سَمْعَكُمْ وَأَبْصَٰرَكُمْ وَخَتَمَ عَلَىٰ قُلُوبِكُم مَّنْ إِلَٰهٌ غَيْرُ ٱللَّهِ يَأْتِيكُم بِهِ ٱنظُرْ كَيْفَ نُصَرِّفُ ٱلْءَايَٰتِ ثُمَّ هُمْ يَصْدِفُونَ

   Say: Have you considered that if Allah takes away your hearing and your sight and sets a seal on your hearts, who is the god besides Allah that can bring it to you? See how We repeat the communications, yet they turn away.
   

3. 33:40 مَّا كَانَ مُحَمَّدٌ أَبَآ أَحَدٍ مِّن رِّجَالِكُمْ وَلَٰكِن رَّسُولَ ٱللَّهِ وَخَاتَمَ ٱلنَّبِيِّۦنَ وَكَانَ ٱللَّهُ بِكُلِّ شَىْءٍ عَلِيمًا

   Muhammad is not the father of any of your men, but he is the Messenger of Allah and the Last of the prophets; and Allah is cognizant of all things.
   

4. 36:65 ٱلْيَوْمَ نَخْتِمُ عَلَىٰٓ أَفْوَٰهِهِمْ وَتُكَلِّمُنَآ أَيْدِيهِمْ وَتَشْهَدُ أَرْجُلُهُم بِمَا كَانُوا۟ يَكْسِبُونَ

   On that day We will set a seal upon their mouths, and their hands shall speak to Us, and their feet shall bear witness of what they earned.
   

5. 42:24 أَمْ يَقُولُونَ ٱفْتَرَىٰ عَلَى ٱللَّهِ كَذِبًا فَإِن يَشَإِ ٱللَّهُ يَخْتِمْ عَلَىٰ قَلْبِكَ وَيَمْحُ ٱللَّهُ ٱلْبَٰطِلَ وَيُحِقُّ ٱلْحَقَّ بِكَلِمَٰتِهِۦٓ إِنَّهُۥ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ

   Or do they say: He has forged a lie against Allah? But if Allah pleased, He would seal your heart; and Allah will blot out the falsehood and confirm the truth with His words; surely He is Cognizant of what is in the breasts.
   

6. 45:23 أَفَرَءَيْتَ مَنِ ٱتَّخَذَ إِلَٰهَهُۥ هَوَىٰهُ وَأَضَلَّهُ ٱللَّهُ عَلَىٰ عِلْمٍ وَخَتَمَ عَلَىٰ سَمْعِهِۦ وَقَلْبِهِۦ وَجَعَلَ عَلَىٰ بَصَرِهِۦ غِشَٰوَةً فَمَن يَهْدِيهِ مِنۢ بَعْدِ ٱللَّهِ أَفَلَا تَذَكَّرُونَ

   Have you then considered him who takes his low desire for his god, and Allah has made him err having knowledge and has set a seal upon his ear and his heart and put a covering upon his eye. Who can then guide him after Allah? Will you not then be mindful?
   

7. 83:25 يُسْقَوْنَ مِن رَّحِيقٍ مَّخْتُومٍ

   They are made to quaff of a pure drink that is sealed (to others).
   

8. 83:26 خِتَٰمُهُۥ مِسْكٌ وَفِى ذَٰلِكَ فَلْيَتَنَافَسِ ٱلْمُتَنَٰفِسُونَ

   The sealing of it is (with) musk; and for that let the aspirers aspire.