Shiva Purana
शिवेनोक्तं प्रवक्ष्यामि क्रमाद्गुरुमुखाच्छ्रुतम् । शिवैको ब्रह्मरूपत्वान्निष्कलः परिकीर्तितः 1-5-१० ।
I shall tell you what Śiva Himself had said and what I heard from my own preceptor. Śiva alone is glorified as Niṣkala (nameless and formless) since He is identical with supreme Brahman.
english translation
zivenoktaM pravakSyAmi kramAdgurumukhAcchrutam । zivaiko brahmarUpatvAnniSkalaH parikIrtitaH 1-5-10 ।
hk transliteration by Sanscript