πῦρ μαχαίρᾳ μὴ σκαλεύειν → poke not the fire with a sword, do not stir the fire with a sword, do not provoke an angry person, do not decide domestic business by violence, don't provoke an angry man

[spiros]

πῦρ μαχαίρᾳ μὴ σκαλεύειν → poke not the fire with a sword, do not stir the fire with a sword, do not provoke an angry person, do not decide domestic business by violence

μην οξύνεις επιθετικές διαθέσεις, don't invite aggression

ignem gladio scrutari → πῦρ μαχαίρᾳ σκαλεύειν

(Often attributed to Pythagoras)