Allāhumma raḥmataka arjū
falā takilnī ilā nafsī ṭarfata `ayn,
wa aṣliḥ lī sha'nī kullah,
lā ilāha illā ant.
O Allah, I hope for Your mercy.
Do not leave me to myself even for the blinking of an eye (i.e. a moment).
Correct all of my affairs for me.
There is none worthy of worship but You.
Reference:
Abu Dawud 4/324, Ahmad 5/42. Al-Albani graded it as good in Sahih Abu Dawud
3/959.