Bhagavad Gita 11.50

संजय उवाच |
इत्यर्जुनं वासुदेवस्थोक्त्वा स्वकं रूपं दर्शयामास भूय: |
अश्वस्यामास च भीतमेनं भूत्वा पुन: सौम्यवपूर्णमहात्मा

Translation

Sanjay said: Having spoken thus, the compassionate son of Vasudev displayed His personal (four-armed) form again. Then, He further consoled the frightened Arjun by assuming His gentle (two-armed) form.