One day while Rama and Krsna, along with Their playmates, were tending the calves on the bank of the River Yamuna, another demon arrived there, desiring to kill Them - SB 10.11.41

Expressions researched:
"One day while Rāma and Kṛṣṇa, along with Their playmates, were tending the calves on the bank of the River Yamunā, another demon arrived there, desiring to kill Them"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

One day while Rāma and Kṛṣṇa, along with Their playmates, were tending the calves on the bank of the River Yamunā, another demon arrived there, desiring to kill Them.

SB 10.11.41, Translation

One day while Rāma and Kṛṣṇa, along with Their playmates, were tending the calves on the bank of the River Yamunā, another demon arrived there, desiring to kill Them.