CC Madhya 18.38
bhuja-daṇḍaḥ sa pātu vaḥ
nīto govardhano giriḥ
Śrī Caitanya Mahāprabhu said, “ ‘May the left arm of Śrī Kṛṣṇa, whose eyes are like the petals of a lotus flower, always protect you. With His left arm He raised Govardhana Hill as if it were a toy.’ ”
This verse is found in the Bhakti-rasāmṛta-sindhu (2.1.62).