Sahih Bukhari | Volume 5 | Hadith Number 445
Narrated by Ibn Umar
On the day of Al-Ahzab (i.e. Clans) the Prophet said, "None of you Muslims) should offer the 'Asr prayer but at Banu Quraiza's place." The 'Asr prayer became due for some of them on the way. Some of those said, "We will not offer it till we reach it, the place of Banu Quraiza," while some others said, "No, we will pray at this spot, for the Prophet did not mean that for us." Later on It was mentioned to the Prophet and he did not berate any of the two groups.