Dawood bin Farqad, who says that I was seated in the house of Imam Ja’far as Sadiq (a.s.) when we saw a pigeon (called Zaghabi) humming. Imam turned towards me and asked,
“O Dawood! Do you know what this bird is saying”?
I replied in the negative. Imam said,
“It curses the murderers of Imam Husayn (a.s.), thus preserve such pigeons in your houses.”
Reference : Nafasul Mahmoom – Shaikh abbas Qummi (r.a.)