Abdullah bin Abbas reported,

I saw the Prophet ﷺ in a dream at midday, standing disheveled and dust-covered, with a flask in his hand containing blood.I said, "May my father and mother be ransom for you, Messenger of Allah, what is this?"He replied, "This is the blood of Husayn and his companions. I have been gathering it all day."We took note of that day, and it was found that he had been killed on that very day.

Ahmad 2553

Sahih

حدثنا عفان حدثنا حماد هو ابن سلمة أخبرنا عمار

عن ابن عباس قال

رأيت النبي ﷺ فيما يرى النائم بنصف النهار وهو قائم أشعث أغبر بيده قارورة فيها دم فقلت بأبي أنت وأمي يا رسول الله ما هذا قال هذا دم الحسين وأصحابه لم أزل ألتقطه منذ اليوم فأحصينا ذلك اليوم فوجدوه قتل في ذلك اليوم

أحمد 2553صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Abdullah bin Abbas bin Abdul-Muttalib
Numbering
Darussalam 2553
Ahmad 2553