لا إلهَ إلاّ اللّهُ وَحْـدَهُ لا شَـريكَ له، لهُ المُلـكُ ولهُ الحَمـد، وهوَ على كلّ شيءٍ قدير، سُـبْحانَ اللهِ، والحمْـدُ لله، ولا إلهَ إلاّ اللهُ واللهُ أكبَر، وَلا حَولَ وَلا قوّة إلاّ باللّهِ العليّ العظيم
La ilaha illal-lahu wahdahu la shareeka lah, lahul-mulku walahul-hamd, wahuwa AAala kulli shay-in qadeer, subhanal-lah, walhamdu lillah, wala ilaha illal-lah wallahu akbar, wala hawla wala quwwata illa billahil-AAaliyyil AAatheem
Translation
None has the right to be worshipped except Allah, alone without associate, to Him belongs sovereignty and praise and He is over all things wholly capable. How perfect Allah is, and all praise is for Allah, and none has the right to be worshipped except Allah, Allah is the greatest and there is no power nor might except with Allah, The Most High, The Supreme.
When to recite
Recited when waking during the night. Then supplicate: "O my Lord forgive me" — one will be forgiven.
Source / Reference
Al-Bukhari 1/384