Hisnul Muslim 65

After the final tashahhud and before salam

اللَّهُمَّ إِنِّي أَسْأَلُكَ بِأَنَّي أَشْهَدُ أَنَّكَ أنْتَ اللَّهُ لَا إِلَهَ إِلَاَّ أَنْتَ، الأَحَدُ الصَّمَدُ الَّذِي لَمْ يَلِدْ وَلَمْ يُولَدْ، وَلَمْ يَكُنْ لَهُ كُفُواً أَحَدٌ

Allaahumma 'innee 'as'aluka bi'annee 'ash-hadu 'annaka 'Antallaahu laa 'ilaaha 'illaa 'Antal-'Ahadus-Samadul-lathee lam yalid wa lam yoolad wa lam yakun lahu kufuwan 'Ahad.

O Allah, I ask You, by the fact that I bear witness that You are Allah. There is none worthy of worship but You, the Only God, Independent of creation, Who was not begotten and begets not, and none is equal to Him.