Shiva Purana
सदा पंचाक्षरस्यैव विशुद्धं ज्ञानमाप्यते । इष्टमन्त्रान्सदा जप्त्वा महापापक्षयं लभेत् 1-16-७० ।
They will attain perfect knowledge. They shall secure the annihilation of the great sins by repeating their favourite mantras.
english translation
sadA paMcAkSarasyaiva vizuddhaM jJAnamApyate । iSTamantrAnsadA japtvA mahApApakSayaM labhet 1-16-70 ।
hk transliteration by Sanscript