The Customary Oath in Kikuyu Society
Long before Mau Mau, the oath, or muma, was a serious binding ritual in Kikuyu life, used to settle disputes, seal agreements, and test truth. An oath-taker swore on sacred objects such as the githathi stone and invoked supernatural sanction, in the belief that a lie or a broken vow would bring sickness or death to the swearer and even their kin. Oaths were graded by gravity and administered by recognized elders under strict procedure. This existing tradition of solemn, self-binding ritual gave the later movement a ready idiom for commitment and secrecy.