Muwatta Malik #210

Yahya related to me from Malik from Ibn Shihab that Abu Bakr ibn Sulayman ibn Abi Hathma said, "I have heard that the Messenger of Allah, may Allah bless him and grant him peace, prayed two rakas of one of the two day-ti me prayers, dhuhr or asr, and said the taslim after two rakas. Dhu'sh-Shamalayn said to him, 'Has the prayer been shortened, Messenger of Allah, or have you forgotten?' The Messenger of Allah, may Allah bless him and grant him peace, said, 'The prayer has not been shortened and I have not forgotten.' Dhu'shShamalayn said, 'It was certainly one of those, Messenger of Allah.' The Messenger of Allah, may Allah bless him and grant him peace, approached the people and said, 'Has Dh u'sh-Shamalayn spoken the truth?' They said, 'Yes, Messenger of Allah,' and the Messenger of Allah, may Allah bless him and grant him peace, completed what remained of the prayer, and then said, 'Peace be upon you.' "