Beware of the days when the first go last
And the last go first

from J. Cole – Miss America Reprise Lyrics on Rap Genius

Meaning

Watch out in the times that the winners (rich, successful, people who have it good) will fall, and the losers (underdogs, poor, people who are struggling) will rise up.

A reference to the Bible (Matthew 20:16) when Jesus says:

So the last will be first, and the first will be last.

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