Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 50
Sanskrit:
पुन: पुन: स्मारयन्ति नन्दगोपसुतं बत ।श्रीनिकेतैस्तत्पदकैर्विस्मर्तुं नैव शक्नुम: ॥ ५० ॥
ITRANS:
punaḥ punaḥ smārayantinanda-gopa-sutaṁ bataśrī-niketais tat-padakairvismartuṁ naiva śaknumaḥ
Translation:
All these remind us constantly of Nanda’s son. Indeed, because we see Kṛṣṇa’s footprints, which are marked with divine symbols, we can never forget Him.