Synonym of don't shit where you eat

Don't do anything you are paying a more qualified person to do.

The frustrations with a system or activity should be blamed on its weaknesses, rather than on individuals who operate within it.

I don't have any money

Indicates that the speaker does not want to discuss a particular topic.

I don't want to buy anything

Alternative form of don't give up your day job

One cannot expect to receive some benefit if one does not pay for it in some way or does not face a counterbalancing hazard or harm.

Used to say that you want someone to do something faster because you do not have enough time to wait for them to finish

(Southern US) Do not act in a manner not in keeping with the way you were brought up.