Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 30

Sanskrit:

यावत् स पादपद्माभ्यां स्पृशनास्ते रमापति: ।तावत् कलिर्वै पृथिवीं पराक्रन्तुं न चाशकत् ॥ ३० ॥

ITRANS:

yāvat sa pāda-padmābhyāṁspṛśan āste ramā-patiḥtāvat kalir vai pṛthivīṁparākrantuṁ na cāśakat

Translation:

As long as Lord Śrī Kṛṣṇa, the husband of the goddess of fortune, touched the earth with His lotus feet, Kali was powerless to subdue this planet.

Purport:

Although even during the time of Lord Kṛṣṇa’s presence on earth Kali had entered the earth to a slight extent through the impious activities of Duryodhana and his allies, Lord Kṛṣṇa consistently suppressed Kali’s influence. Kali could not flourish until Lord Kṛṣṇa had left the earth.