Shiva Purana
ततश्च विष्णुना दृष्टं किमेतद्दृश्यतेऽद्भुतम्॥ इत्याश्चर्यं तदा दृष्ट्वा शिरसः कम्पनं कृतम् ॥ १३ ॥
On seeing it and thinking “What is this wonderful thing in sight”, Viṣṇu shook his head.
english translation
tatazca viSNunA dRSTaM kimetaddRzyate'dbhutam॥ ityAzcaryaM tadA dRSTvA zirasaH kampanaM kRtam ॥ 13 ॥
hk transliteration by Sanscript