Musnad Ahmad 333:12

'Abd al-Razzaq narrated to us, he said: Ibn Jurayj informed us, he said: Ibn Shihab, 'Abd al-Rahman ibn 'Abd Allah ibn Ka'b ibn Malik al-Ansari informed me, that Salamah ibn al-Akwa' said: On the day of Khaybar, my brother fought a fierce battle alongside the Messenger of Allah, peace and blessings of Allah be upon him, then his sword recoiled upon him and killed him. The companions of the Messenger of Allah, peace and blessings of Allah be upon him, spoke about that, and they doubted regarding him—a man who died by his own weapon—they doubted some of his affair. Salamah said: The Messenger of Allah, peace and blessings of Allah be upon him, returned from Khaybar, and I said: "O Messenger of Allah, will you permit me to recite *rajaz* poetry for you?" The Messenger of Allah, peace and blessings of Allah be upon him, permitted him. 'Umar said to him: "Know what you are saying." He said: So I said: "By Allah, were it not for Allah, we would not have been guided, Nor would we have given charity, nor would we have prayed." The Messenger of Allah, peace and blessings of Allah be upon him, said: "You have spoken the truth." "So send down tranquility upon us, And make firm the feet if we meet [the enemy], And the polytheists have transgressed against us." When I finished my *rajaz*, the Messenger of Allah, peace and blessings of Allah be upon him, said: "Who said this?" I said: "My brother said it." The Messenger of Allah, peace and blessings of Allah be upon him, said: "May Allah have mercy on him." I said: "O Messenger of Allah, by Allah, people are hesitant to pray over him, and they say: 'A man who died by his own weapon.'" The Messenger of Allah, peace and blessings of Allah be upon him, said: "He died as a striver and a struggler." Ibn Shihab said: Then I asked the son of Salamah ibn al-Akwa', and he narrated to me from his father the same as what 'Abd al-Rahman narrated to me from him, except that the son of Salamah said: The Messenger of Allah, peace and blessings of Allah be upon him, said along with that: "They are hesitant to pray over him? They have lied. He died as a striver and a struggler, and he has his reward twice." And the Messenger of Allah, peace and blessings of Allah be upon him, gestured with his two fingers.