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CC Ādi 13.28

paugaṇḍa-vayase paḍena, paḍāna śiṣyagaṇe
sarvatra karena kṛṣṇa-nāmera vyākhyāne
Synonyms: 
paugaṇḍa-vayase — in the age of paugaṇḍa; paḍena — studies; paḍāna — teaches; śiṣya-gaṇe — disciples; sarvatra — everywhere; karena — does; kṛṣṇa-nāmera — the holy name of Lord Kṛṣṇa; vyākhyāne — description.
Translation: 
During His paugaṇḍa age He became a serious student and also taught disciples. In this way He used to explain the holy name of Kṛṣṇa everywhere.