Question: The Companions preserved the record of the Prophet's every act and condition with the utmost care. So why are such important miracles not related through more than or lines of transmission? And why are the main reporters only Companions like Jabir. Anas and Abu Hurayra and not for example. Abu Bakr and 'Umar?

Answer: The answer to the first part is given in the Fourth Sign's Third Essential (p. 89). Concerning the second part just as a patient goes to a doctor engineers are consulted about engineering matters and muftis are asked about religious issues some scholarly Companions were entrusted with and devoted themselves to instructing the following generations in the Prophetic Traditions. For example. Abu Hurayra devoted his life to preserving Traditions. while 'Umar shouldered administrative matters and the caliphate's problems. Thus 'Umar narrated only a few Traditions for he had confidence in such people as Abu Hurayra. Anas and Jabir to instruct the Muslims in the Traditions. In fact a Tradition can be considered as established if it is reported by a well‑known person belonging to the truthful sincere and trusted Companions. Given this there is no need for it to be related by others. This is why some significant incidents have only one two or three channels.