Sahih al-Bukhari 3691
Narrated Abu Sa`id Al-Khudri:
I heard Allah's Messenger (ﷺ) saying, "While I was sleeping, the people were presented to me (in a dream). 
They were wearing shirts, some of which were merely covering their (chests). and some were a bit 
longer. `Umar was presented before me and his shirt was so long that he was dragging it." They asked, 
"How have you interpreted it, O Allah's Messenger (ﷺ)?" He said, "Religion."
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، حَدَّثَنَا اللَّيْثُ، عَنْ عُقَيْلٍ، عَنِ ابْنِ شِهَابٍ، قَالَ أَخْبَرَنِي أَبُو أُمَامَةَ بْنُ سَهْلِ بْنِ حُنَيْفٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ـ رضى الله عنه ـ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏"‏ بَيْنَا أَنَا نَائِمٌ رَأَيْتُ النَّاسَ عُرِضُوا عَلَىَّ وَعَلَيْهِمْ قُمُصٌ، فَمِنْهَا مَا يَبْلُغُ الثَّدْىَ، وَمِنْهَا مَا يَبْلُغُ دُونَ ذَلِكَ، وَعُرِضَ عَلَىَّ عُمَرُ وَعَلَيْهِ قَمِيصٌ اجْتَرَّهُ ‏"‏‏.‏ قَالُوا فَمَا أَوَّلْتَهُ يَا رَسُولَ اللَّهِ قَالَ ‏"‏ الدِّينَ ‏"‏‏.‏