لَا إِلَهَ إِلَّا أَنْتَ سُبْحَانَكَ إِنِّي كُنْتُ مِنَ الظَّالِمِينَ
There is no deity except You; exalted are You. Indeed, I have been of the wrongdoers.
Source: Al-Anbiya 21:87, At-Tirmidhi
No Muslim supplicates with it except that Allah answers him.
حَسْبُنَا اللَّهُ وَنِعْمَ الْوَكِيلُ
Allah is sufficient for us, and He is the best disposer of affairs.
Source: Al Imran 3:173
إِنَّا لِلَّهِ وَإِنَّا إِلَيْهِ رَاجِعُونَ، اللَّهُمَّ أْجُرْنِي فِي مُصِيبَتِي وَأَخْلِفْ لِي خَيْرًا مِنْهَا
Indeed we belong to Allah and indeed to Him we return. O Allah, reward me in my affliction and replace it for me with something better.
Source: Muslim
اللَّهُمَّ إِنِّي عَبْدُكَ ابْنُ عَبْدِكَ ابْنُ أَمَتِكَ... أَنْ تَجْعَلَ الْقُرْآنَ رَبِيعَ قَلْبِي وَنُورَ صَدْرِي وَجِلَاءَ حُزْنِي وَذَهَابَ هَمِّي
O Allah, I am Your servant, son of Your servant, son of Your maidservant... I ask You to make the Quran the spring of my heart, the light of my chest, the remover of my sorrow and anxiety.
Source: Ahmad
Allah removes grief and replaces it with joy.
اللَّهُمَّ رَحْمَتَكَ أَرْجُو فَلَا تَكِلْنِي إِلَى نَفْسِي طَرْفَةَ عَيْنٍ وَأَصْلِحْ لِي شَأْنِي كُلَّهُ لَا إِلَهَ إِلَّا أَنْتَ
O Allah, Your mercy I hope for, so do not leave me in charge of myself even for the blink of an eye. Rectify all of my affairs. There is no deity except You.
Source: Abu Dawud
اللَّهُ اللَّهُ رَبِّي لَا أُشْرِكُ بِهِ شَيْئًا
Allah, Allah is my Lord; I do not associate anything with Him.
Source: Abu Dawud
يَا حَيُّ يَا قَيُّومُ بِرَحْمَتِكَ أَسْتَغِيثُ
O Living, O Sustainer, by Your mercy I seek relief.
Source: At-Tirmidhi
لَا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللَّهِ
There is no might nor power except with Allah.
Source: Bukhari, Muslim
A treasure from Paradise.