DON'T TAKE ANYTHING PERSONAL is typical gangster phrase in movies. ' (It is not) nothing personal means that he will be executed but that there is no hatred, but it is the circumstances that force him to be killed. It is an irony and part of the sadism and evil involved in the act. In real life it can be something less ominous, such as a dismissal or expulsion.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list