Sahih al-Bukhari 1089
Book 18: Shortening the Prayers (At-Taqseer) · Narrated by Anas bin Malik
Arabic
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، وَإِبْرَاهِيمَ بْنِ مَيْسَرَةَ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ صَلَّيْتُ الظُّهْرَ مَعَ النَّبِيِّ صلى الله عليه وسلم بِالْمَدِينَةِ أَرْبَعًا، وَبِذِي الْحُلَيْفَةِ رَكْعَتَيْنِ.
English translation
Narrated Anas bin Malik: I offered four rak`at of Zuhr prayer with the Prophet (ﷺ) at Medina and two rak`at at Dhul-Hulaifa. (i.e. shortened the `Asr prayer)
Reference: Sahih al-Bukhari 1089, Book of Shortening the Prayers (At-Taqseer). English translation by Dr. Muhammad Muhsin Khan.