Shiva Purana
प्रक्षाल्य तापयेत्पात्रं प्रोक्षयेदन्यदंभसा ॥ स्वसूत्रोक्तप्रकारेण कुण्डादौ विल्लिखेत्ततः ॥ ११ ॥
After washing the vessel, heat it and sprinkle it with other water. Then he should write on the beginning of the pot in the manner prescribed by his own thread
english translation
prakSAlya tApayetpAtraM prokSayedanyadaMbhasA ॥ svasUtroktaprakAreNa kuNDAdau villikhettataH ॥ 11 ॥
hk transliteration by Sanscript