Here is the Sanskrit anuvad, Hindi anuvad, and English translation of Raja-Vidya-Raja-Guhya Yoga Chapter 9, Verse 9.31.
Sanskrit
क्षिप्रं भवति धर्मात्मा शश्वच्छान्तिं निगच्छति । कौन्तेय प्रति जानीहि न मे भक्तः प्रणश्यति ॥ ९.३१ ॥
Hindi
वह शीघ्र ही धर्मात्मा हो जाता है और सदा रहनेवाली परम शान्तिको प्राप्त होता है । हे अर्जुन! तू निश्चयपूर्वक सत्य जान कि मेरा भक्त नष्ट नहीं होता|
English
This evil man will then soon become a very pure and pious man in time. He will then attain eternal peace and happiness, Realize this truth O Arjuna, that he who is My true devotees, shall never suffer destruction.