Shiva Purana
यदा भवद्गिरीन्द्रस्ते पुत्रो मम पिता स्वयम् ॥ तदा पितामहस्त्वं मे जातो लोकपितामह ॥ ३१ ॥
When the lord of mountains, my father became your son you became my grandfather, O grandfather of the worlds!
english translation
yadA bhavadgirIndraste putro mama pitA svayam ॥ tadA pitAmahastvaM me jAto lokapitAmaha ॥ 31 ॥
hk transliteration by Sanscript