Al-Mutaffifin - 83:26

خِتَامُهُ مِسْكٌ وَفِي ذَلِكَ فَلْيَتَنَافَسِ الْمُتَنَافِسُونَ
[83:26]
The sealing of it is (with) musk; and for that let the aspirers aspire.
The seal thereof will be Musk: And for this let those aspire, who have aspirations:
Whose seal is musk - for this let (all) those strive who strive for bliss -