when the news of Imam Husayn (a.s.)’s martyrdom was announced, Abdullah bin Ja’far held a mourning assembly, so people came to him to offer their condolences (for the martyrdom of his sons Aun and Muhammad). His retainer Abul Lislas (or Salasil) said to him, “This is what we got from Husayn.” Abdullah was enraged and hurled a sandal at him saying, “O son of an adulteress woman! How dare you say something like that about Husayn? By Allah! Had I been with him, I would not have liked to part with him before being killed defending him. By Allah! What consoles me is that both my sons were martyred in his defense, together with my brother as well as my cousin, who all stood firmly on his side.”
Then he turned towards those in his presence and said, “Praise to Allah! It is surely very heavy upon my heart to see Husayn (a.s.) get killed, and that I could not defend him with my life, but both my sons have.” These being the words of an honest and sincere adherer of the Household (Ahlul Bayt (a.s.)) of the Prophet (S).
Reference : Nafasul Mahmoom – Shaikh abbas Qummi (r.a.)