Any tips how to stop 1 year old from biting?

My one year old keeps biting my 3 year old when he won’t share his toys or when my 3 year old goes near him. His bite marks get pretty bad one time he bit me and it left a huge bruise and bite mark. The other day He bit my 6 year olds cheek thank god he didn’t get to grab him enough to leave a bite mark 😩🥺 I tell him no when he does it and I say ouch like I’m in pain but it’s not working. Any tips?

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