It's better to dead a beef than let it breathe
Then we don't succeed
Cause then you gotta murder dummies

from Nas (Ft. Anthony Hamilton) – World's An Addiction Lyrics on Rap Genius

Meaning

Beefing eats up time and hinders success of who ever is beefing…so its better to kill the beef and the remove the burden that can hold you back in achieving more in life. He goes on to say that if you don’t dead it, then you have to murder someone which of course is worse.

This likely refers to the ending of the infamous Nas vs Jay-Z beef

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