Bismillaah:

The Prophet صلي الله عليه وسلم said:

Whoever says when he goes to bed:

لا اِلهَ اِلَّا اللّهُ وَحْدَهُ لا شَرِيكَ لَهُ ، لَهُ الْمُلْكُ وَ لَهُ الْحَمْدُ وَ هُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ

وَ لا حَوْلَ وَ لا قُوَّةَ اِلَّا بِاللّهِ

سُبْحَانَ اللّهِ ، والْحَمْدُللّهِ ، وَ لا اِلهَ اِلَّا اللّهُ ، وَ اللّهُ اَكْبَرُ

" La ilaha illa Allaahu wahdahu la shareeka lahu, lahul mulku wa lahul hamdu wa huwa ala kulli shayin qadeer

Wa laa howla Wa laa Quwatta Ila bilaah

SubhanAllaah, wal Hamdulillaah, Wa laa ilaha ilal la wallaahu Akbar "

... then his sins will be forgiven even if they are like the foam upon the sea.

Takhreej:

{ Imam Ibn Hibbaan in his Saheeh }

***And Allaah عزوجل knows best ***