ذَهَـبَ الظَّمَـأُ، وَابْتَلَّـتِ العُـروق، وَثَبَـتَ الأجْـرُ إِنْ شـاءَ الله
Dhahabaẓ-ẓama', wabtallati ‘l-`urūq, wa thabata ‘l-'ajru in shā Allāh.
The thirst is gone, the veins are moistened, and the reward is confirmed, if Allah wills.
Abu Dawud 2/306 and others. See also Al- Albani, Sahihul-Jami' As-Saghir 4/209.
اللّهُـمَّ إِنَّـي أَسْـأَلُـكَ بِرَحْمَـتِكَ الّتي وَسِـعَت كُلَّ شيء، أَنْ تَغْـفِرَ لي
Allāhumma innī as'aluka bi raḥmatika ‘l-latī wasi`at kulla shay' an taghfira lī.
O Allah, I ask You by Your mercy, which encompasses all things, that You forgive me.
Ibn Majah 1/557 from a supplication of Abdullah bin 'Amr. Al-Hafidh graded it as good in his checking of An-Nawawi's Kitabul-'Athkdr. See Sharhul- Athkar 4/342.