Sahih Muslim Book 6, Hadith 21

Salim b. 'Abdullah (b. 'Umar) reported on the authority of his father that Allah's Messenger (ﷺ) 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'ahs at the beginning of his caliphate, but he then completed four.

Previous Hadith

A hadith like this has been transmitted by Anas, but no mention has been made of Pilgrimage.

Sahih Muslim Book 6, Hadith 20
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A hadith like this has been reported by Zuhri, with the same chain of transmitters, and in it mention was made of Mina only, but not of other places.

Sahih Muslim Book 6, Hadith 22