When he heard about Musaylimah's claim of prophecy, al-Ahnaf went with his uncle to meet him.
Ibn an-Nawwahah was a messenger for Musaylimah, a purported prophet during the time of Muhammad who had gained a significant following through his tricks and miracles, teachings and from the fact that he was from Yamamah.
Musaylimah sought to abolish prayer and freely allow sex and Alcohol consumption.
The Battle of Yamama was fought in December 632 as part as the Ridda Wars ("Apostate Wars") on the plain of Aqraba in the region of Yamama (in present-day Saudi Arabia) between the forces of Muslim Caliph Abu Bakr and Musaylimah, a self-proclaimed prophet.
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Then Musaylimah came under the hawk-like gaze of the Wahshy ibn Harb (the same man who killed Hamza, the uncle of Muhammad, in the Battle of Uhud before accepting Islam).