In times of distress
Bukhari, Muslimلَا إِلَهَ إِلَّا اللَّهُ الْعَظِيمُ الْحَلِيمُ، لَا إِلَهَ إِلَّا اللَّهُ رَبُّ الْعَرْشِ الْعَظِيمِ
La ilaha illallahul-'Azimul-Halim, la ilaha illallahu Rabbul-'Arshil-'Azim
There is no god but Allah, the Mighty, the Forbearing. There is no god but Allah, Lord of the Magnificent Throne.
Seeking forgiveness (Sayyid al-Istighfar)
Bukhariاللَّهُمَّ أَنْتَ رَبِّي لَا إِلَهَ إِلَّا أَنْتَ، خَلَقْتَنِي وَأَنَا عَبْدُكَ، وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ
Allahumma anta rabbi la ilaha illa ant, khalaqtani wa ana 'abduk, wa ana 'ala 'ahdika wa wa'dika mastata't
O Allah, You are my Lord, there is no god but You. You created me and I am Your servant, and I keep Your covenant and promise as much as I am able.
For anxiety and sorrow
Bukhariاللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الْهَمِّ وَالْحَزَنِ، وَالْعَجْزِ وَالْكَسَلِ
Allahumma inni a'udhu bika minal-hammi wal-hazan, wal-'ajzi wal-kasal
O Allah, I seek refuge in You from worry and grief, from incapacity and laziness.