Sahih Bukhari

Allah's Messenger (ﷺ) said, "While I was sleeping I saw (in a dream) somepeople wearing shirts of which some were reaching up to the breastsonly while others were even shorter than that. Umar bin Al-Khattab wasshown wearing a shirt that he was dragging." The people asked, "Howdid you interpret it? (What is its interpretation) O Allah's Messenger (ﷺ)?"He (the Prophet (ﷺ) ) replied, "It is the Religion."