Here is what an-Nawawi has said: “In this tradition (the tradition of Abu Hurayra about this event) there is an evidence showing that if an absolute imam thinks something and one of his followers thinks the opposite, then the inferior follower has to show his opinion to the superior imam to think of it. If it appears that the opinion of the inferior is right, the superior has to adopt it; otherwise he has to explain to his follower the defects of his opinion…”Sharh Sahih Muslim, vol.1 p.404.)
As for Abu Mahthoora, he was one of the freed captives of Mecca When the Muslims conquered Mecca, the Prophet (S) forgave the polytheists and set them free. and he was one of those, whom the Prophet (S) gifted in order to reconcile them to Islam. When the Prophet (S) went back from Hunayn victoriously, he was the most hated one to Abu Mahthoora and his orders and principles were the most hated things to him too. Abu Mahthoora often mocked at the Prophet’s caller (who announced azan) but the pouch of silver coins, which the Prophet (S) had given, the booties of Hunayn, which the Prophet (S) had spread among the freed captives, who were his enemies and who had fought him for a long time, his great morals towards whoever had announced shahada from among the hypocrites besides his severity towards the unbelievers and that the Arabs began to become Muslims group by group, all that forced Abu Mahthoora and his likes to announce shahada by their tongues whereas their hearts were still occupied by the idols. He did not emigrate until he died in Mecca.
He, who knew the opinion of our Sunni brothers of the four sects about the start of the azan and iqama
Al-Halabi mentioned in his Seera (Vol.2 p.110.) that Ibn Umar and Imam Zaynul Aabideen Ali bin al-Husayn (as) used to say “come to the best of deeds” after “come to success” in the azan. This has been mentioned in the true and recurrent traditions of Ahlul Bayt (as). Refer to their traditions and jurisprudence to see their opinions about the matter.
The Muslims have disagreed on the beginning of the iddah of death, (When a woman’s husband dies.) which is four months and ten days. The Sunni believe that the iddah of death begins since the husband dies whether the wife knows of her husband’s death or she does not know because of his being far away from her or because of any other reason.
As for the Shia, they believe that the iddah of death begins when a wife knows of her husband’s death even if the death has taken place some time ago. She has no right to get married until she passes the iddah, which is four months and ten days, since the moment she knows of her husband’s death. And then she can get married according to the clear verse after passing the iddah and after the mourning that a wife has to show after the death of her husband.