People who bite the hand that feeds them usually lick the boot that kicks them.

If it can lick, it can bite

I think, first, it's important not to bite the hand that feeds you.

Don't bite the hand that feeds you

The proverb warns that 'You should not bite the hand that feeds you.' But maybe you should, if it prevents you from feeding yourself.

Don't bite the hand that stabs you in the back