Shiva Purana
नरनारायणाख्यौ याववतारौ हरेर्मुने ॥ तत्प्रार्थितश्शिवस्तत्स्थैः केदारे हिमभूधरे ॥ २४ ॥
It was at the request of the twofold incarnations of Viṣṇu, named Nara and Nārāyaṇa that Śiva stayed in Kedāra on the mountain Himavat, O sage.
english translation
naranArAyaNAkhyau yAvavatArau harermune ॥ tatprArthitazzivastatsthaiH kedAre himabhUdhare ॥ 24 ॥
hk transliteration by Sanscript