(1) باب صَلاَةِ الْمُسَافِرِينَ وَقَصْرِهَا
Anas reported:
The Messenger of Allah (ﷺ) said four rak'ahs in the noon prayer while at Medina, but he offered two rak'ahs in the afternoon prayer at Dhu'l-Hulaifa. (DE)
Reference (DE): Sahih Muslim 690 a (DE)
In-book reference (DE): Book 6, Hadith 12 (DE)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1469 (DE)