Abu Qabil narrates: When Husayn bin Ali (may Allah be pleased with them both) was martyred, they cut off his head, and at the first halting place they sat down to drink wine (nabidh), presenting the head to one another as a greeting. Suddenly an iron pen came out of a wall and wrote this verse in blood:
"Does a nation that killed Husayn hope for the intercession of his grandfather on the Day of Reckoning?"
So they fled and left the head there, then they came back.
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2860