Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrated: I saw the Prophet (peace and blessings be upon him) in a dream one day at midday; he (peace and blessings be upon him) was dishevelled and covered in dust, and in his (peace and blessings be upon him) hand was a flask containing blood. I said: "May my father and mother be sacrificed for you, O Messenger of Allah! What is this?" He (peace and blessings be upon him) said: "This is the blood of Husayn and his companions; I have been gathering it continuously since earlier today." The narrator said: Then that day was reckoned, and it was found that he (Husayn, may Allah be pleased with him) had been martyred on that very day.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12782