(Cause the nigga that said he’ll) blast for ya (is now) blastin for ya
That’s an assassin for ya

from Jay Z (Ft. Kanye West & Mr. Hudson) – Why I Love You Lyrics on Rap Genius

Meaning

Ironic contradiction. The ones who once said they would “blast for [him]” (shoot others for him) and now “blasting for [him]” (shooting at him).

It may be another reference to Beanie Sigel. The idea of loyal hit-men may also be a callback to a verse from Jay-Z’s song “La-La-La”. This line is also probably a play on what makes an assassin. A good assassin kills targets, but the best assassin kills other assassins. In short, the person who once said he’d kill for you (to help his own rise to the top) is now going to kill you to get to your spot.

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