Bhagavad-gītā As It Is · Text 11.50
Krishna restores His gentle personal form
सञ्जय उवाच
इत्यर्जुनं वासुदेवस्तथोक्त्वा
स्वकं रूपं दर्शयामास भूय: ।
आश्वासयामास च भीतमेनं
भूत्वा पुन: सौम्यवपुर्महात्मा ॥ ५० ॥
sañjaya uvāca
ity arjunaṁ vāsudevas tathoktvā
svakaṁ rūpaṁ darśayām āsa bhūyaḥ
āśvāsayām āsa ca bhītam enaṁ
bhūtvā punaḥ saumya-vapur mahātmā
Sañjaya said to Dhṛtarāṣṭra: The Supreme Personality of Godhead, Kṛṣṇa, having spoken thus to Arjuna, displayed His real four-armed form and at last showed His two-armed form, thus encouraging the fearful Arjuna.
Read Śrīla Prabhupāda's purport on Vedabase.io