SB 10.8.21
kalena vrajatalpena
gokule rama-kesavau
janubhyam saha panibhyam
ringamanau vijahratuh
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
After a short time passed, both brothers, Rama and Krsna, began to crawl on the ground of Vraja with the strength of Their hands and knees and thus enjoy Their childhood play.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
One brahmana devotee says:
srutim apare smrtim itare bharatam anye bhajantu bhava-bhitah
aham iha nandam vande yasyalinde param brahma
“Let others, fearing material existence, worship the Vedas, the Vedic supplementary Puranas and the Mahabharata, but I shall worship Nanda Maharaja, in whose courtyard the Supreme Brahman is crawling.” For a highly exalted devotee, kaivalya, merging into the existence of the Supreme, appears no better than hell (narakayate). But here one can simply think of the crawling of Krsna and Balarama in the courtyard of Nanda Maharaja and always merge in transcendental happiness. As long as one is absorbed in thoughts of krsna-lila, especially Krsna’s childhood pastimes, as Pariksit Maharaja desired to be, one is always merged in actual kaivalya. Therefore Vyasadeva compiled Srimad-Bhagavatam. Lokasyajanato vidvams cakre satvata-samhitam (Bhag. 1.7.6). Vyasadeva compiled Srimad-Bhagavatam, under the instruction of Narada, so that anyone can take advantage of this literature, think of Krsna’s pastimes and always be liberated.
srutim apare smrtim itare bharatam anye bhajantu bhava-bhitah
aham iha nandam vande yasyalinde param brahma