Narrated Abu Sa’id Al-Khudri: Prophet Muhammad (Sallallaahu-Alayhi-wasallam) said, “I was sleeping when I saw some people in a dream. They were wearing shirts, some that just covered their chests, and others that were a little longer. Then, ‘Umar bin Al-Khattab passed by me, wearing a shirt that was so long he was dragging it on the ground.” The people asked, “What is your interpretation of this dream, O Prophet?” He replied, “It represents the Religion.” (Bukhari)