A Muslim's du'a

Abdullah ibn 'Amr ibn al-'As, may Allah be pleased with him and his father, said, "Fine things, he who embodies them will be happy in this world and in the next -
the first is to regularly say, 'La ilaha illa Allah, Muhammadun rasulu Allah' - There is no god but Allah, Muhammad is the Messenger of Allah;

the second is to say when inflicted with a calamity, Inna lillahi wa inna ilayhi raji'un, wa la hawla wa la quwwata illa billahil 'aliyyil 'azim - Verily we belong to Allah and to Him we shall all return, and there is no power or might except by the will of Allah the most High, the Mighty;

the thrid is to say in gratitude when given a blessing, 'Alhamdulillahi rabbil 'alamin' - Praise be to Allah, Lorad of the Universe;

the fourth is to say when beginning anything, 'Bismillahir rahmanir rahim' - In the name of Allah the most Merciful the most Kind;

and the fifth is to say upon committing a sin, 'Astaghfiru llahal 'azima wa atubu ilayh' - I seek the forgiveness of Allah the Greatest and I repent to Him.

(Preparing for the day of Judgement by Imam ibn Hajar al-asqalani)

Be free...

On that Day from distress and remorse... (This khabar was transmitted through the sage Wahb ibn Munabbih)

Allah Most High proclaims:

'O Children of Adam, if you could see the minute span of precious time that remains until your death, you would renounce all selfish projects and vain expectations. You would restrain your desire to possess, in all its subtle forms. And you would wholeheartedly seek to intensify your good actions. Otherwise, regret will seize you as you are falling into death, when your family and servants leave you, when friends distance themselves from you and even intimates abandon you. From the moment of death, you will no longer be able to return to your people or increase your good actions. Therefore, live now with a clear vision of the Day of Resurrection and be free on that Day from distress and remorse.'