My 19 month old won’t stop biting his sister

How do I get him to stop? It's usually when she takes his toys, takes his food, etc. So I understand why he's biting, I just don't know what to do to get him to stop! I've tapped his mouth gently and said no bite and put him in time out on my lap while I explain no bite. But it's been multiple times a day the last couple of days. I'm addressing the behavior with my daughter too but she's 3.5 so that's been a huge battle as well. Any help is appreciated!