Shiva Purana
देवैश्च ऋषिभिश्चापि स्वात्मसिद्ध्यर्थमेव हि । समंत्रेणात्महस्तेन कृतं यच्छुद्धमंडले ३९ ।
It is performed with the mantra by the gods and sages, for the purpose of self-realization. It is done with a purified hand in the sacred circle.
english translation
devaizca RSibhizcApi svAtmasiddhyarthameva hi । samaMtreNAtmahastena kRtaM yacchuddhamaMDale 39 ।
hk transliteration by Sanscript