It is narrated from a man of Banu Deil that once I performed the Zuhr prayer at my home and set out with my camels to hand them over to the shepherds. On the way, I passed by the Prophet (peace be upon him) who was leading the people in the Zuhr prayer. I passed by there, and when the Prophet (peace be upon him) came to know, he said, "What prevented you from praying with us?" I submitted, "O Messenger of Allah (peace be upon him), I had already performed the prayer at my home." The Prophet (peace be upon him) said, "Even though you had already performed the prayer (you should have joined us with the intention of a voluntary prayer)."