Hazrat Nabi Aadam (‘alaihis salaam) was a prophet of Allah Ta‘ala. He was the first human being to be created, and hence he is the father of all mankind.

Before creating Nabi Aadam (‘alaihis salaam), Allah Ta‘ala had created the Jinn and they were residing in the earth. After some time, they began to spread corruption in the earth and kill one another. Allah Ta‘ala then sent angels who fought these jinn and exiled them to the islands. (Tafseer Ibnu Katheer 1/127)