Shiva Purana
अक्षरं पशुरित्युक्तः क्षरं पाश उदाहृतः ॥ क्षराक्षरपरं यत्तत्पतिरित्यभिधीयते ॥ १४ ॥
The Paśu is called Akṣara. The Pāśa is called Kṣara. Pati is called Kṣarākṣarapara.
english translation
akSaraM pazurityuktaH kSaraM pAza udAhRtaH ॥ kSarAkSaraparaM yattatpatirityabhidhIyate ॥ 14 ॥
hk transliteration by Sanscript