Hadith 6181
وَعَن ابْن عَبَّاس قَالَ: رَأَيْت النَّبِي صلى الله عَلَيْهِ وسل فِيمَا يَرَى النَّائِمُ ذَاتَ يَوْمٍ بِنِصْفِ النَّهَارِ أَشْعَثَ أَغْبَرَ بِيَدِهِ قَارُورَةٌ فِيهَا دَمٌ فَقُلْتُ: بِأَبِي أَنْتَ وَأُمِّي مَا هَذَا؟ قَالَ: «هَذَا دَمُ الْحُسَيْنِ وَأَصْحَابِهِ وَلَمْ أَزَلْ أَلْتَقِطُهُ مُنْذُ الْيَوْم» فأحصي ذَلِك الْوَقْت فأجد قبل ذَلِكَ الْوَقْتِ. رَوَاهُمَا الْبَيْهَقِيُّ فِي «دَلَائِلِ النُّبُوَّةِ» وَأحمد الْأَخير
Ibn `Abbas told that one day at midday he saw in a dream the Prophet disheveled and dusty with a bottle containing blood in his hand and said, "You for whom I would give my father and mother as ransom, what is this?" He replied, "This is the blood of al-Husain and his companions which I have been collecting to-day." He told that he was reckoning that time and found that he had been killed at that time. Baihaqi transmitted the two traditions in Dala'il an-nubuwa and Ahmad transmitted the second.