لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ، لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ، سُبْحَانَ اللَّهِ، وَالْحَمْدُ لِلَّهِ، وَلَا إِلَهَ إِلَّا اللَّهُ، وَاللَّهُ أَكْبَرُ، وَلَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللَّهِ
Transliteration
La ilaha illallahu wahdahu la sharika lahu, lahul-mulku wa lahul-hamdu wa huwa 'ala kulli shay'in qadirun, subhanallahi, walhamdu lillahi, wa la ilaha illallahu, wallahu akbaru, wa la hawla wa la quwwata illa billah
English meaning
None has the right to be worshipped except Allah, alone without partner. To Him belongs all sovereignty and praise, He is over all things omnipotent. How perfect Allah is, all praise is for Allah, none has the right to be worshipped except Allah, Allah is the Greatest. There is no might or power except with Allah.
When is it recited?
Recited upon waking at night, then one may make dua or pray.
Its virtue
Whoever says this and then makes dua will be answered, and if they pray it will be accepted.
Source
Bukhari, Tahajjud 21, 1154