Shiva Purana
एवं शक्तिसमायोगाच्छक्तिमानुच्यते शिवः ॥ शक्तिशक्तिमदुत्थं तु शाक्तं शैवमिदं जगत् ॥ ३६ ॥
Śiva is called Śaktimān since he is in association with it. This universe born of both Śakti and Śaktimān is termed Śākta and Śaiva.
english translation
evaM zaktisamAyogAcchaktimAnucyate zivaH ॥ zaktizaktimadutthaM tu zAktaM zaivamidaM jagat ॥ 36 ॥
hk transliteration by Sanscript