Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 36

Sanskrit:

मा खिद्यतं महाभागौ द्रक्ष्यथ: कृष्णमन्तिके ।अन्तर्हृदि स भूतानामास्ते ज्योतिरिवैधसि ॥ ३६ ॥

ITRANS:

mā khidyataṁ mahā-bhāgaudrakṣyathaḥ kṛṣṇam antikeantar hṛdi sa bhūtānāmāste jyotir ivaidhasi

Translation:

O most fortunate ones, do not lament. You will see Kṛṣṇa again very soon. He is present in the hearts of all living beings, just as fire lies dormant in wood.

Purport:

Uddhava understood that Nanda and Yaśodā were very impatient to see Kṛṣṇa, and thus he reassured them that Śrī Kṛṣṇa would come soon.