This teaches us that the sea split for Yisrael in the merit of their “emunah.” Therefore, those tzaddikim who believed in Hashem and his loyal servant Moshe, and jumped into the raging waters without fear for their lives, deserved to have the sea split on their behalf. 

The Sea Split a Second Time Specifically for Datan and Aviram 

The Sea Was Enraged by Datan and Aviram