What is the Islamic legal ruling on killing non-combatants, such as farmers, traders, and monks, during war?

1. It is permissible if they support the enemy economically
2. It is absolutely forbidden (Haram)
3. It is permissible if the enemy does the same
4. It is discouraged but not forbidden

Islamic law strictly prohibits the intentional targeting of non-combatants. This ruling is based on the direct teachings of the Prophet Muhammad (PBUH), who forbade killing those who are not participating in fighting. This protection extends to civilians like farmers, traders, and religious figures. Such an act is considered a transgression and is absolutely forbidden (haram).