Shiva Purana
पदमेव हितं नित्यमनित्याः पदिनः स्मृताः ॥ पदानां परिवृत्ति स्यान्मुच्यंते पदिनो यतः ॥ ४ ॥
The word is permanent. The object indicated by the word is non-permanent. The words are transferable since those indicated by the words are released.
english translation
padameva hitaM nityamanityAH padinaH smRtAH ॥ padAnAM parivRtti syAnmucyaMte padino yataH ॥ 4 ॥
hk transliteration by Sanscript