How do you help a friend who you’re 90% positive that they’re having a psychotic episode, but he thinks everyone or a group of people wants to harm

Him/put him in a body bag. I’ve told him where he can get help, he wants to prove his sanity, but it seems more like a mental breakdown. He’s a friend and a neighbor so even if I want to I can’t cut him off. I don’t do that to friends especially with a mental health problem. I’ve had a few psychotic episodes myself and thought an organization was after me. If he’s going through a psychotic episode I know the hell he’s living in. I don’t think my neighbors are out to get him. He seems to shift the blame on one person in the apartment building to others whom we don’t know. How do I help him?