What did Allah's Messenger (peace be upon him) observe about praying two rak'ahs while travelling?
 Salim b. 'Abdullah (b. 'Umar) reported on the authority of his father that Allah's Messenger (way peace be upon him) observed the prayer of a traveller, i. e. two rak'ahs in Mina, and other places; so did Abu Bakr and 'Umar, and 'Uthman too observed two rak'abs at the beginning of his caliphate, but he then completed four.