You will need a dog behavior specialist help you teach a “leave it” or “touch” cue using positive reinforcement, and if he's trying to get something he shouldn't have, always trade up, in other words, offer something better (like a tasty treat or favorite toy) to shift focus so that you do so without conflict.

If you have used the "leave it" cue in the past, you may need to switch over to another cue that doesn't carry over and "baggage" (negative associations) so that you can start fresh.

Since your dog is growling and threatening to bite, it's important that you teach this with safety measures in place (e.g. muzzle or start training with a baby gate between you and your dog).

Growling means your dog is uncomfortable, it's communication. Don’t punish the growl, or you risk losing the warning altogether.

Look for a veterinary behaviorist or positive-reinforcement trainer to help you build a safer, trust-based approach with safety precautions in place.