When affairs become difficult
اللَّهُمَّ لاَ سَهْلَ إِلاَّ مَا جَعَلْتَهُ سَهْلاً، وَأَنْتَ تَجْعَلُ الْحَزْنَ إِذَا شِئْتَ سَهْلاً
Allāhumma lā saḥla illā ma ja`altahu saḥla wa anta taj`alu ‘l-ḥazna idhā shi'ta saḥla.
O Allah, there is no ease other than what You make easy. If You please You ease sorrow.
Hisn al-Muslim 139
Before going to bed
بِاسْمِكَ اللَّهُمَّ أَمُوتُ وَأَحْيَا
Bismika Allahumma amutu wa ahya
With Your name, O Allah, I die and I live
Sahih al-Bukhari 6324
When waking up
الْحَمْدُ لِلَّهِ الَّذِي أَحْيَانَا بَعْدَ مَا أَمَاتَنَا، وَإِلَيْهِ النُّشُورُ
Al-hamdu lil-lahil-ladhi ahyana ba'da ma amatana; wa ilaihi an-nushur
All the Praises are for Allah Who has made us alive after He made us die (sleep) and unto Him is the Resurrection.
Sahih al-Bukhari 6324
Asking for forgiveness from Allah
اللَّهُمَّ أَنْتَ رَبِّي، لاَ إِلَهَ إِلَّا أَنْتَ، خَلَقْتَنِي وَأَنَا عَبْدُكَ، وَأَنَا عَلَى عَهْدِكَ وَوَعْدِكَ مَا اسْتَطَعْتُ، أَعُوذُ بِكَ مِنْ شَرِّ مَا صَنَعْتُ، أَبُوءُ لَكَ بِنِعْمَتِكَ عَلَيَّ، وَأَبُوءُ لَكَ بِذَنْبِي، فَاغْفِرْ لِي، فَإِنَّهُ لاَ يَغْفِرُ الذُّنُوبَ إِلَّا أَنْتَ
Allahumma anta Rabbi la ilaha illa anta, Khalaqtani wa ana `Abduka, wa ana `ala `ahdika wa wa`dika mastata`tu, A`udhu bika min Sharri ma sana`tu, abu'u Laka bini`matika `alaiya, wa abu'u laka bidhanbi faghfir lee fa innahu la yaghfiru adhdhunuba illa anta
O Allah, You are my Lord, there is none worthy of worship except You. You have created me, and I am Your servant, and I am faithful to Your covenant and promise as much as I can. I seek refuge in You from the evil of what I have done. I acknowledge Your blessings upon me, and I admit my sins. So forgive me, for none forgives sins except You.
Sahih al-Bukhari 6306
When entering the masjid
اللَّهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
Allahumma iftah li abwāba raḥmatika
O Allah! open for me the doors of Thy mercy" ; and when he steps out he should say: 'O Allah! I beg of Thee Thy Grace.
Sahih Muslim 713a
Seeking Refuge From A Bad End, And Misery
أَعُوذُ بِكَلِمَاتِ اللَّهِ التَّامَّاتِ مِنْ شَرِّ مَا خَلَقَ
‘A‘ūdhu bi‑kalimātillāhi al‑tāmmāti min sharri mā khalaq
I seek refuge in the Perfect Word of Allah from the evil of what He has created
Sahih Muslim 2708a