اللَّهُمَّ إِنِّي أَعُوْذُ بِكَ مِنْ عَذَابِ الْقَبْرِ، وأَعُوْذُ بِكَ مِنْ فِتْنَةِ الْمَسِيحِ الدَّجَّالِ، وَأَعُوْذُ بِكَ مِنْ فِتْنَةِ الْمَحْيَا وَالْمَمَاتِ، اللَّهُمَّ إِنِّي أَعُوْذُ بِكَ مِنَ الْمَأْثَمِ وَالْمَغْرَمِ

O Allāh, I take refuge in You from the punishment of the grave, and I take refuge in You from the temptation and trial of al-Masīḥ al-Dajjāl, and I take refuge in You from the trials and tribulations of life and death. O Allāh, I take refuge in You from sin and debt.

Reference: Al-Bukhārī (#832, 2/102) and Muslim (#589, 1/412). The wording is from Muslim.