Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 12
Sanskrit:
भारतैवं वत्सपेषु भुञ्जानेष्वच्युतात्मसु ।वत्सास्त्वन्तर्वने दूरं विविशुस्तृणलोभिता: ॥ १२ ॥
ITRANS:
bhārataivaṁ vatsa-peṣubhuñjāneṣv acyutātmasuvatsās tv antar-vane dūraṁviviśus tṛṇa-lobhitāḥ
Translation:
O Mahārāja Parīkṣit, while the cowherd boys, who knew nothing within the core of their hearts but Kṛṣṇa, were thus engaged in eating their lunch in the forest, the calves went far away, deep into the forest, being allured by green grass.