اَللَّهُمَّ (إِنَّهُ) عَبْدُكَ وَابْنُ عَبْدِكَ وَابْنُ أَمَتِكَ كَانَ يَشْهَدُ أَنْ لَا إِلَهَ إِلَّا أَنْتَ وَأَنَّ مُحَمَّدًا عَبْدُكَ وَرَسُوْلُكَ وَأَنْتَ أَعْلَمُ بِهِ اَللَّهُمَّ إِنْ كَانَ مُحْسِنًا فَزِدْ فِي إِحْسَانِهِ وَإِنْ كَانَ مُسِيْئًا فَتَجَاوَزْ عَنْ سَيِّئَاتِهِ اَللَّهُمَّ لَا تَحْرِمْنَا أَجْرَهُ وَلَا تَفْتِنَّا بَعْدَهُ

Alla-humma, (innahu) ‘abduka, wabnu‘ 'abdika, wabnu amatika, ka-na yashhadu an laa ilaaha illa anta, wa anna mu’hmmadan ‘abduka wa rasooluka, wa aanta a'laamu bihi. Alla-humma, in kaana mu'hhsinan fajid fi e'hsaa-nihi, wa in ka-na musi-an fataja-waz ‘an saiyyi-aa-tihi. Alla-humma laa-ta'harimna-ajrahu, wala-taftinna ba'adahu

O Allah, this man is Your servant, the son of Your male servant, the son of female servant. He testified that there is no true ilaah but you and that Muhammad (ﷺ) is your servant and your messenger. And you are more aware of it. O Allah, if he is a doer of good, then increase his goodness. And if he has sinned, then forgive him. O Allah, do not deprive us of His reward and do not tempt us after that.

Reference: Sahih Mawkuf (Albani). Al-Muwatta: 539