Zuhayr told his companions, “The one who desires to come with me can do so, or else this is my last covenant with him. And I desire to relate to you an incident,
when we had fought the battle of Lanjar and Allah gave us victory. We won a lot of spoils in hand, when Salman Bahili (some say Salman Farsi) told us: Are you contented with this victory which has been given to you and with the wealth that has come to you? And we replied in the affirmative.
Then he said: When you meet the Prince of the youth from the Progeny of Muhammad (referring to Imam Husayn), be more joyful to fight alongside him than you are with the booty that you just received.”
Zuhayr continued, “I give you in Allah’s refuge.” Then Zuhayr always remained among the companions of Imam until he attained martyrdom.
Reference : Nafasul Mahmoom – Shaikh abbas Qummi (r.a.)