Bhagavad Gita 11.50
सञ्जय उवाच
इत्यर्जुनं वासुदेवस्तथोक्त्वा
स्वकं रूपं दर्शयामास भूयः।
आश्वासयामास च भीतमेनं
भूत्वा पुनः सौम्यवपुर्महात्मा।।11.50।।
Sanjaya uvacha
Ityarjunam vasudevastathoktva
Svakam rupam darshayamasa bhuyah
Ashvasayamasa cha bhitamenam
Bhutva punah saumyavapurmahatma
Simple meaning, written by AISanjaya relates that after speaking these words, Krishna again displayed His divine form, reassuring the frightened Arjuna, and then assumed His gentle, noble demeanor.