Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 22

Sanskrit:

कृष्णप्राणान्निर्विशतो नन्दादीन् वीक्ष्य तं ह्रदम् ।प्रत्यषेधत् स भगवान् राम: कृष्णानुभाववित् ॥ २२ ॥

ITRANS:

kṛṣṇa-prāṇān nirviśatonandādīn vīkṣya taṁ hradampratyaṣedhat sa bhagavānrāmaḥ kṛṣṇānubhāva-vit

Translation:

Lord Balarāma then saw that Nanda Mahārāja and the other cowherd men, who had dedicated their very lives to Kṛṣṇa, were beginning to enter the serpent’s lake. As the Supreme Personality of Godhead, Lord Balarāma fully knew Lord Kṛṣṇa’s actual power, and therefore He restrained them.

Purport:

Śrīla Sanātana Gosvāmī explains that Lord Balarāma checked some of the cowherd men by speaking to them, others by physically holding them and still others by casting upon them His potent smiling glance. Distraught over the situation, they were prepared to give up their lives for Lord Kṛṣṇa by entering the serpent’s lake.