Shiva Purana
शिवसंसर्गतस्त्वेष शोध्यात्मैव हि शुध्यति ॥ अयस्यग्नौ समाविष्टे दाहो ऽग्नेरेव नायसः ॥ ४६ ॥
The Ātman alone is purified through the contact with Śiva. If the iron-rod is put in fire and heated, the burning is that of the fire, not of the iron-rod.
english translation
zivasaMsargatastveSa zodhyAtmaiva hi zudhyati ॥ ayasyagnau samAviSTe dAho 'gnereva nAyasaH ॥ 46 ॥
hk transliteration by Sanscript