Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 27
Sanskrit:
कथयां चक्रतुर्गाथा: पूर्वा गुरुकुले सतो: ।आत्मनोर्ललिता राजन् करौ गृह्य परस्परम् ॥ २७ ॥
ITRANS:
kathayāṁ cakratur gāthāḥpūrvā gurukule satoḥātmanor lalitā rājankarau gṛhya parasparam
Translation:
[Śukadeva Gosvāmī continued:] Taking each other’s hands, O King, Kṛṣṇa and Sudāmā talked pleasantly about how they once lived together in the school of their guru.