Narrator:Abdullāh ibn ‘Umar
وَعَنِ ابْنِ عُمَرَ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم يَقُول: «بَيْنَا أَنَا نَائِمٌ رَأَيْتُ النَّاسَ يُعْرَضُونَ عَلَيَّ وَعَلَيْهِمْ قُمُصٌ مِنْهَا مَا يَبْلُغُ الثُّدِيَّ وَمِنْهَا مَا دُونَ ذَلِكَ وَعُرِضَ عَلَيَّ عُمَرُ بْنُ الْخَطَّابِ وَعَلَيْهِ قَمِيصٌ يَجُرُّهُ» قَالُوا: فَمَا أَوَّلْتَ ذَلِكَ يَا رَسُولَ اللَّهِ؟ قَالَ: «الدِّينَ» . مُتَّفَقٌ عَلَيْهِ
Abu Sa'id reported God's messenger as saying, "While I was asleep, I saw people being presented before me wearing shirts some of which reached the nipples while others did not reach so far. Then `Umar b. al-Khattab was presented to me wearing a shirt which he was trailing." He was asked how he interpreted that and replied that it meant religion. (Bukhari and Muslim.)
Cited in Mishkat al-Masabih (No. 6038).