When the ultimatum (barã'at) against the pagan Arabs of Mecca was revealed, first Abu Bakr was assigned to convey it to the Meccans; but later on this great responsibility was taken away from him and entrusted to 'Ali. 'Ali was entrusted with safety of the city and citizens of Medina while the Prophet had gone on the expedition to Tabûk. 'Ali was appointed the leader of the expedition to Yemen. These are just the few examples that come to mind at random. Therefore, on a comparative level, 'Ali bin Abu Tãlib was a person who had been tried and entrusted with greater responsibilities more than Abu Bakr.
(Çááåã æÇá ãä æÇáÇå æÚÇÏö ãä ÚÇÏÇå¡æÇäÕÑ ãä äÕÑå æÇÎÐá ãä ÎÐáå) (Ewe Mwenyezi Mungu mpende mwenye kumtawalisha Ali na mfanyie uadui mwenye kumfanyia uadui Ali, na mnusuru na kumsaidia mwenye kumnusuru na kumsaidia Ali na muachilie mbali mwenye kumtupa mkono na kumuacha Ali), Mtume (s.a.w.w) akatamka na kuleta jumla ambayo lafdhi yake ina ihtimali ya maana ya jumla ya kwanza ambayo alitangulia kuisema, nalo ni tamko (ãæáì) kuna ihtimali likawa na maana ya (alie bora) japokuwa kuna ihtimali likawa na maana nyingine tofauti na maana ya kwanza, kwa hivyo inakuwa ni wajibu kuwa atakuwa amemaanisha kwa tamko hilo maana iliyo tangulia hapo mwanzo kutokana na hali halisi ya matumizi ya wana lugha.