Shiva Purana
पृष्ठतः पार्श्वतस्तस्य चाग्रतश्च स्थितावुभौ ॥ प्रणिपत्य किमात्मेदमित्यचिंतयतां तदा ॥ ४३ ॥
They stood in front, at the back and on cither side of it and bowed. They began to think “Of what nature is this?”
english translation
pRSThataH pArzvatastasya cAgratazca sthitAvubhau ॥ praNipatya kimAtmedamityaciMtayatAM tadA ॥ 43 ॥
hk transliteration by Sanscript