Sahih Muslim Book 4, Hadith Number 1553.

Chapter : Excellence of observing two Rak’ahs in the mosque for one who comes back from a journey.

Abd al-Rahman b. Abu Laila reported: No one has ever narrated to me that he saw the Apostle of Allah (may peace be upon him) observing the forenoon prayer, except Umm Hani. She, however, narrated that the Apostle of Allah (may peace be upon him) entered her house on the day of the Conquest of Mecca and prayed eight rak’ahs (adding): I never saw a shorter prayer than it except that he performed the bowing and prostration completely. But (one of the narrators) Ibn Bashshar in his narration made no mention of the word: “Never”.