I will, I will climb the highest mountain
Before the flood comes

from Kendrick Lamar – War Is My Love Lyrics on Rap Genius

Meaning

To avoid a flood where everyone at the lower levels get wiped out, Kendrick is going to climb a mountain to reach a high altitude.

This is a metaphor for his career, really: he’s vying to reach a higher level than the average person so that things that harm the average man will not harm him.

“When the flood comes” may refer to when the music industry will wipe out a lot of rapper when they’ll think “rap is really dead”

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