In Juba Arabic, the prohibitive is expressed by means of two special negative markers: máta [PROH.SG], mátakum [PROH.PL] which resulted from the grammaticalization of the negative sentences ma íta [NEG 2SG] and ma ítakum [NEG 2PL].
Source: Manfredi 2005: 171
Source: Tosco 1995: 428
Source: Manfredi 2005: 162