al-Mu’akh-khir
On the authority of Ibn ‘Abbaas (may Allaah be pleased with him), the Prophet (may Allaah raise his rank and grant him peace) used to wake up at night for prayers and say a long supplication, from it:
“…Forgive me for what has passed and what will come, and for what I have kept hidden and what I have done openly. You are the One who brings things forth, and You are al-Mu’akh-khir, there is none worthy of worship except You.”
Collected by al-Bukhaaree (1120); It is also found with different wordings in Saheeh Muslim on the authority of ‘Alee (771) and Aboo Moosaa (2719).
Reference:
Exemplary principles concerning the beautiful names of Allaah.
Shaykh Muhammad Ibn Saalih Al-‘Uthaymeen D. 1421 H
Translated by Moosaa Richardson
Revised 2nd Edition with additional commentary.