They say don't bite the hand that feeds you
Even if I wanted to, I can't, no teeth to

from Joe Budden – Old School Mouse Lyrics on Rap Genius


“Don’t bite the hand that feeds you” is an idiom that means not to act spiteful against those trying to help you.

Joe states in the following line that he couldn’t even if he wanted to; there’s nothing he can do to spite Jay-Z.

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