اللَّهُمَّ اجْعَلْنِي مِنَ التَّوَّابِينَ وَاجْعَلْنِي مِنَ الْمُتَطَهِّرِينَ
O Allah, make me of those who return to You often in repentance and make me of those who remain clean and pure.
At-Tirmidhi 1/78. See also Al-Albani, Sahih At- Tirmidhi 1/18