Shiva Purana
तस्मादितः परं नास्ति परित्राणमिहात्मनः ॥ इति मत्वा प्रयुंजानः कर्मेदं शुभमश्नुते ॥ १०० ॥
Hence, a person performing this rite with the conviction that there is no greater protection for the Ātman enjoys the benefit.
english translation
tasmAditaH paraM nAsti paritrANamihAtmanaH ॥ iti matvA prayuMjAnaH karmedaM zubhamaznute ॥ 100 ॥
hk transliteration by Sanscript