Sayyid ibn Tawoos relates, that after the martyrdom of Muslim bin Awsaja, ‘Amr bin Qartah Ansari came forward and pleaded with Imam to permit him to go to the battlefield. When Imam permitted him, he attacked with such force, which was similar to that of the one who yearns for Paradise. Thus he strived to serve the Master of Heavens, until he killed a group of people from the army of Ubaydullah bin Ziyad.
There was no arrow, which would advance towards Imam, except that he stopped it with his hands, and there was no sword which would come towards Imam, except that he took it upon himself. Then Imam did not receive any wounds until ‘Amr was alive. When he was totally wounded, he turned towards Imam and said, “O son of the Prophet of Allah! Have I fulfilled my (duty of) obedience”? Imam replied,
“Verily yes, you shall be the one to go to Paradise before me. Then offer my salutations to the Prophet of Allah (S) and tell him that I am on my way following you.”
Then ‘Amr fought bravely until he attained martyrdom (May Allah’s Mercy and Blessings be upon him).
Reference : Nafasul Mahmoom – Shaikh abbas Qummi (r.a.)