What were the Ridda wars under Abu Bakr?

The Ridda wars (or riddah), occurring circa 632–633 CE, were a series of politico-religious uprisings across Arabia that challenged the authority of Abū Bakr following the death of the Prophet Muhammad.12

Upon Muhammad’s death, many Bedouin tribes—who had previously pledged nominal adherence to Islam and agreed to pay the zakāt—revolted. These tribes viewed the Prophet's passing as the termination of their contract with the Medinan government, seeking to reassert their independence and cease tax payments. They rallied around several rival prophets, most notably Musaylimah.1

Under the generalship of Khālid ibn al-Walīd, Abū Bakr’s forces suppressed these rebellions. A decisive, albeit costly, victory occurred at the Battle of Yamama (the "Garden of Death") in 633 CE, where the core of the opposition was destroyed. These wars were critical in reuniting Arabia under the caliphate and establishing the strength of the central government, ultimately enabling the subsequent expansion of the Islamic state into Iraq, Syria, and beyond.123