اللّهُـمَّ اجْعَلنـي مِنَ التَّـوّابينَ وَاجْعَـلْني مِنَ المتَطَهّـرين.
Allāhummaj`alnī minat-tawwābīna waj`alnī minal-mutaṭahhirīn.
O Allah, make me among those who turn to You in repentance, and make me among those who are purified.
At-Tirmidhi 1/78. See also Al-Albani, Sahih At- Tirmidhi 1/18