There is [allegedly] no reference to child marriage in the history of the Arabs, so if Mohammed did this, one would expect this out of the ordinary incident to be reported by large numbers of people.
Hakuna sehemu [inadaiwa] inayoongelea ndoa za watoto katika historia ya Waarabu, kwa hiyo kama Muhammad alifanya jambo hili, ingetegemewa kuwa jambo hili lisilokuwa la kawaida lilipotiwe na idadi kubwa ya watu.