The character of the expedition sent by Prophet in the 4 H., which ended in the killing of the participants at Bi'rima'Ona is rather obscure. The reasons Iying under the organization of the expedition of Bi'rimaOna, and interests expected by the sides, the number and qualities of the companions engaged in this event appear to be different in the sources and studies. In addition, it is not clear enough whether this expedition was organized due to the political, military or religious aims. It is understood that the Prophet organized such an expedition to reinforce his authority on the Arab clans- the authority which decreased after the battle of Uhud and to invite the tribes to Islam.