One day while Kṛṣṇa was playing with His small playmates, including Balarāma and other sons of the gopas, all His friends came together and lodged a complaint to mother Yaśodā. “Mother,” they submitted, “Kṛṣṇa has eaten earth.”
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एकदा क्रीडमानास्ते रामाद्या गोपदारकाः । कृष्णो मृदं भक्षितवानिति मात्रे न्यवेदयन्
ekadā krīḍamānāste rāmādyā gopadārakāḥ | kṛṣṇo mṛdaṃ bhakṣitavāniti mātre nyavedayan
SB 10.8.32