The Messenger of Allah ﷺ said, "While I was sleeping, I saw people being shown to me, each wearing a shirt. Some shirts reached the chest, others fell short of that. Then Umar bin Khattab passed by me wearing a shirt so long that he was dragging it behind him."They asked, "What did you interpret it to mean, Messenger of Allah?"He replied, "Religion."
قال رسول الله ﷺ: بينما أنا نائم رأيت الناس يعرضون علي، وعليهم قميص، منها ما يبلغ الثدي، ومنها ما يبلغ دون ذلك، ومر علي عمر بن الخطاب، وعليه قميص يجره قالوا: ما أولته يا رسول الله؟ قال: الدين
Bukhari narrated it in the Book of Dream Interpretation (7008), and Muslim in the Book of the Virtues of the Companions (2390), both through Salih bin Kaysan, from Ibn Shihab, who said, Abu Umama bin Sahl told me that he heard Abu Saeed Khudri say what he mentioned.