One Fifth
Root letters:

Kh-Miim-Siin

khums

8:41
وَاعْلَمُوا أَنَّمَا غَنِمْتُمْ مِنْ شَيْء ٍ فَأَنَّ لِلَّهِ خُمُسَه ُُ وَلِلرَّسُولِ وَلِذِي الْقُرْبَى وَالْيَتَامَى وَالْمَسَاكِينِ وَابْنِ السَّبِيلِ إِنْ كُنتُمْ آمَنْتُمْ بِاللَّهِ وَمَا أَنزَلْنَا عَلَى عَبْدِنَا يَوْمَ الْفُرْقَانِ يَوْمَ الْتَقَى الْجَمْعَانِ وَاللَّهُ عَلَى كُلِّ شَيْء ٍ قَدِير ٌ
Wa A`lamū 'Annamā Ghanimtum Min Shay'in Fa'anna Lillāhi Khumusahu Wa Lilrrasūli Wa Lidhī Al-Qurbá Wa Al-Yatāmá Wa Al-Masākīni Wa Abni As-Sabīli 'In Kuntum 'Āmantum Billāhi Wa Mā 'Anzalnā `Alá `Abdinā Yawma Al-Furqāni Yawma At-Taqá Al-Jam`āni Wa Allāhu `Alá Kulli Shay'in Qadīrun 


And know that anything you profit, one-fifth shall go to God and the messenger, and the relatives, and the orphans, and the poor, and the wayfarer. You will do this if you believe in God and in what We revealed to Our servant on the Day of the Criterion, the day the two armies clashed; and God is capable of all things.