اللَّهُمَّ إِنِّي أَصْبَحْتُ أُشْهِدُكَ وَأُشْهِدُ حَمَلَةَ عَرْشِكَ وَمَلَائِكَتَكَ وَجَمِيعَ خَلْقِكَ أَنَّكَ أَنْتَ اللَّهُ لَا إِلَهَ إِلَّا أَنْتَ وَحْدَكَ لَا شَرِيكَ لَكَ وَأَنَّ مُحَمَّدًا عَبْدُكَ وَرَسُولُكَ
Transliteration
Allahumma inni asbahtu ushhiduka wa ushhidu hamalata 'arshika wa mala'ikataka wa jami'a khalqika annaka antallahu la ilaha illa anta wahdaka la sharika laka wa anna Muhammadan 'abduka wa rasuluk
English meaning
O Allah, verily I have reached the morning and call on You, the bearers of Your throne, Your angels, and all of Your creation to witness that You are Allah, none has the right to be worshipped except You, alone without partner, and that Muhammad is Your servant and messenger.
When is it recited?
Recited 4 times in the morning and evening.
Its virtue
Whoever says this 4 times, Allah will free them from the Hellfire.
Source
Abu Dawud, Adab 101, 5069