According to search-discovered classical Islamic scholarship, the purpose of sending prophets and messengers (Rusul) is a fundamental aspect of Allah's mercy and guidance for humanity. Tafsir on verses like 2:213 explains that after mankind deviated from its original state of unity, Allah sent prophets as 'bringers of good tidings and warners'. Their primary mission, as synthesized from the works of authorities like Ibn Kathir, was to call people back to pure monotheism (Tawheed), to deliver divine scripture as a means to judge between people in their disputes, and to serve as perfect role models. Quran 6:48 further crystallizes their role as bearers of good news for the righteous and warners against the consequences of evil. Furthermore, verses such as 14:4 and 14:5 highlight the method and ultimate goal of their mission: making the message clear by speaking the language of their people and bringing them from the 'darknesses into the light'. This comprehensive purpose ensures that humanity receives clear guidance, removing any excuse for disbelief and establishing Allah's justice and mercy on Earth.