O Allah, make me among those who turn to You in repentance, and make me among those who are purified...

Reference:At-Tirmidhi 1/78. See also Al-Albani, Sahih At- Tirmidhi 1/18Hisnul Muslim 14

اللّهُـمَّ اجْعَلنـي مِنَ التَّـوّابينَ وَاجْعَـلْني مِنَ المتَطَهّـرين.

Transliteration

Allāhummaj`alnī minat-tawwābīnawaj`alnī minal-mutaṭahhirīn.

Translation

O Allah, make me among those who turn to You in repentance, and make me among those who are purified.