Then (after waking up the cowherd boys and calves with his horn bugle) Krsna and the boys, keeping their respective groups of calves before them, proceeded from Vrajabhumi to the forest - SB 10.12.1

Expressions researched:
"Then Kṛṣṇa and the boys, keeping their respective groups of calves before them, proceeded from Vrajabhūmi to the forest."

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

Śukadeva Gosvāmī continued: O King, one day Kṛṣṇa decided to take His breakfast as a picnic in the forest. Having risen early in the morning, He blew His bugle made of horn and woke all the cowherd boys and calves with its beautiful sound. Then Kṛṣṇa and the boys, keeping their respective groups of calves before them, proceeded from Vrajabhūmi to the forest.

SB 10.12.1, Translation

Śukadeva Gosvāmī continued: O King, one day Kṛṣṇa decided to take His breakfast as a picnic in the forest. Having risen early in the morning, He blew His bugle made of horn and woke all the cowherd boys and calves with its beautiful sound. Then Kṛṣṇa and the boys, keeping their respective groups of calves before them, proceeded from Vrajabhūmi to the forest.