Shiva Purana
सर्वत्र मंत्रं विन्यस्य तत्तन्मंत्रपुरस्सरम् ॥ स्नानकाले तु संप्राप्ते सर्वमङ्गलनिस्वनैः ॥ ३० ॥
Placing the mantra everywhere followed by that mantra When the time came for bathing all the auspicious sounds were heard.
english translation
sarvatra maMtraM vinyasya tattanmaMtrapurassaram ॥ snAnakAle tu saMprApte sarvamaGgalanisvanaiH ॥ 30 ॥
hk transliteration by Sanscript