After a short time passed, both brothers, Rāma and Kṛṣṇa, began to crawl on the ground of Vraja with the strength of Their hands and knees and thus enjoy Their childhood play.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कालेन व्रजताल्पेन गोकुले रामकेशवौ । जानुभ्यां सह पाणिभ्यां रिङ्गमाणौ विजह्रतुः
kālena vrajatālpena gokule rāmakeśavau | jānubhyāṃ saha pāṇibhyāṃ riṅgamāṇau vijahratuḥ
SB 10.8.21