Shiva Purana
पदमेव हि तन्नित्यमनित्याः पदिनः स्मृताः ॥ पदानां प्रतिकृत्तौ तु मुच्यन्ते पदिनो यतः ॥ २६ ॥
The steps themselves are considered to be eternal and impermanent. When the footsteps are replicated the footsteps are released.
english translation
padameva hi tannityamanityAH padinaH smRtAH ॥ padAnAM pratikRttau tu mucyante padino yataH ॥ 26 ॥
hk transliteration by Sanscript