لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ، لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ
Transliteration
La ilaha illallahu wahdahu la sharika lahu, lahul-mulku wa lahul-hamdu wa huwa 'ala kulli shay'in qadir
English meaning
None has the right to be worshipped except Allah, alone, without partner. To Him belongs all sovereignty and praise, and He is over all things omnipotent.
When is it recited?
Recited 100 times a day.
Its virtue
The reward of freeing 10 slaves, 100 good deeds, 100 sins erased, and protection from Satan until evening.
Source
Bukhari, Da'awat 64, 6403; Muslim, Dhikr 28, 2693