(1) باب صَلاَةِ الْمُسَافِرِينَ وَقَصْرِهَا
Ya'la b. Umayya reported:
I said to 'Umar b. al-Khattab, and the rest of the hadlth is the same. (ID)
Reference (ID): Sahih Muslim 686 b (ID)
In-book reference (ID): Book 6, Hadith 5 (ID)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1462 (ID)