Final answer:
The question pertains to a historical Islamic event relating to Prophet Muhammad's reaction to the killing of his messenger. While specific details are not provided in the text, Islamic tradition and history record various context-specific responses by the Prophet that upheld Islamic principles and sought justice.
Step-by-step explanation:
The question addresses an event in Islamic history concerning the Prophet Muhammad's (PBUH) reaction to the killing of one of his messengers. The hadiths (traditions or sayings of the Prophet) and Islamic historical sources provide details on such events.
While the provided text does not directly address a specific incident involving the killing of a messenger of the Prophet, there are recorded instances where such misfortunes befalling the Prophet's envoys resulted in various reactions, including calls for justice or even armed conflict under certain historical contexts. In these situations, responses were calculated and were meant to uphold the principles of Islam, seek justice, or defend the Muslim community (ummah). Given the historical records, it's crucial to understand that actions taken were context-specific and grounded in the societal norms and geopolitical realities of the 7th century.