Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 16
Sanskrit:
प्रातर्व्रजाद् व्रजत आविशतश्च सायंगोभि: समं क्वणयतोऽस्य निशम्य वेणुम् । निर्गम्य तूर्णमबला: पथि भूरिपुण्या:पश्यन्ति सस्मितमुखं सदयावलोकम् ॥ १६ ॥
ITRANS:
prātar vrajād vrajata āviśataś ca sāyaṁgobhiḥ samaṁ kvaṇayato ’sya niśamya veṇumnirgamya tūrṇam abalāḥ pathi bhūri-puṇyāḥpaśyanti sa-smita-mukhaṁ sa-dayāvalokam
Translation:
When the gopīs hear Kṛṣṇa playing His flute as He leaves Vraja in the morning with His cows or returns with them at sunset, the young girls quickly come out of their houses to see Him. They must have performed many pious activities to be able to see Him as He walks on the road, His smiling face mercifully glancing upon them.