(17) باب صَلاَةِ الْعَصْرِ فِي السَّفَرِ .
It was narrated from Anas bin Malik that the Prophet (ﷺ) prayed Zuhr in Al-Madinah, four Rak'ahs, and he prayed 'Asr in Dhul-Hulaifah, two Rak'ahs.
Reference: Sunan an-Nasa'i 477
In-book reference: Book 5, Hadith 30
English translation: Vol. 1, Book 5, Hadith 478