All the Sahabah – including Abu Bakr and ‘Umar - considered mut’ah to be halal throughout the lifetime of the Prophet, and throughout the rule of Abu Bakr. For most of the era of ‘Umar, all the Sahabah generally affirmed the permissibility of mut’ah. However, at the end of his caliphate, he made it haram; and that changed everything. The generality of the Sahabah obeyed him; and only a handful remained steadfast in affirming the permissibility of temporary marriage. Some of the Tabi’in also proclaimed it halal. However, the number of the pro-mut’ah elements continued to dwindle among the Ahl al-Sunnah, until none – or almost none - accepted it anymore. The Shi’is, on their part, have remained unshakable and unyielding on the permissibility of temporary marriage – from the time of the Messenger till this very day of ours.