رَبَّنَا لَغَفُورٌ شَكُورٌ
Rabbana la Ghafurun shakur
Our Lord is indeed Oft-Forgiving Ready to appreciate (service) - 35: 34
When the dwellers of Jannah will be entering Jannah, they will be saying the above.
Ibn Umar (R.A.) narrates that Nabi (Sallallahu alaihi wasallam) has said: The reciters of the kalimah will have no fear at the time of death, nor will they experience fear in the grave, nor on the plains of reckoning. I am seeing them wiping the dust off their heads (at the time of arising from their graves) and they will be saying the above.
الحَمدُ لِلَّهِ الَّذى أَذهَبَ عَنَّا الحَزَنَ ۖ إِنَّ رَبَّنا لَغَفورٌ شَكورٌ
alhamdu lillahi allathee athhaba AAanna alhazana inna rabbana laghafoorun shakoorun
Praise belongs to Allah who has removed all sorrow from us. Indeed, our Lord is the Forgiver, the Multiplier of the rewards
( Surah Fatir, Chapter 35, Verse 34)