don't mess with
Don't play with fire.
No juegues con sus sentimientos.
Don't play with their feelings.
Cuántas veces te he dicho que no juegues con Ranjit.
How many times have I told you not to play with Ranjit?
— Estrellas en la Tierra (2007)
Don't play with the key.
Te he dicho muchas veces que no juegues con Remoleto, es peligroso.
I've told you many times not to play with Remoleto; it's dangerous.
— Roma. Ciudad abierta (1945)
Don't play with matches.