Shiva Purana
एवं पूजयतोश्शंभुं तयोर्विष्ण्ववतारयोः ॥ चिरकालो व्यतीताय शैवयोर्धर्मपुत्रयोः ॥ ३ ॥
A long time elapsed while these two incarnations of Viṣṇu, the spiritual sons of Śiva, performed the worship of Śiva.
english translation
evaM pUjayatozzaMbhuM tayorviSNvavatArayoH ॥ cirakAlo vyatItAya zaivayordharmaputrayoH ॥ 3 ॥
hk transliteration by Sanscript