SB 12.2.30
yavat sa pada-padmabhyam
sprsan aste rama-patih
tavat kalir vai prthivim
parakrantum na casakat
Translation:
As long as Lord Sri Krsna, 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 Krsna’s presence on earth Kali had entered the earth to a slight extent through the impious activities of Duryodhana and his allies, Lord Krsna consistently suppressed Kali’s influence. Kali could not flourish until Lord Krsna had left the earth.