How to politely dismiss an employee?

[deucher]

There are cases when you need to fire an employee. Let’s say he made some mistake that he doesn’t admit, but you know it’s his fault, how can you fire him so that he doesn’t damage your property or even injure you because he feels angry, because not all people openly show that they are aggressive, he can work with you years, but you will not know what is inside him and what he can do to you.