Iyas bin Salamah narrates from his father (Sayyiduna Salamah bin al-Akwa' (may Allah be pleased with him)) that he said: We went on a military expedition with the Messenger of Allah (peace and blessings be upon him). He mentioned the long hadith, in which it is stated that they raided the grazing livestock of the Messenger of Allah (peace and blessings be upon him). The narrator said: Then I climbed the hill of Thaniyyah and, facing towards Madinah, called out three times; then I went out after the people, shooting arrows at them and reciting rajaz verses: I am the son of al-Akwa'; today is the day the base are destroyed.
In it, it is also stated: When we went to Khaybar, my uncle Amir (may Allah be pleased with him) was saying:
"By Allah! Were it not for Allah, we would not have been guided, nor would we have given charity, nor would we have prayed; and we are rich only through Your bounty. If we meet the enemy, make our feet firm, and send down tranquillity upon us."
The Prophet (peace and blessings be upon him) asked: "Who is this?" The Companions (may Allah be pleased with them) replied: It is Amir. He (peace and blessings be upon him) said: "May your Lord forgive you." In it, it is also stated: When they went to Khaybar, Marhab came brandishing his sword and said:
"Khaybar knows that I am Marhab, fully armed, a brave and seasoned warrior, when the fires of war blaze up."
So my uncle answered him:
"Khaybar knows that I am Amir, fully armed and brave."
Then he mentioned in the hadith that he put his sword into its sheath, and Sayyiduna Ali (may Allah be pleased with him) drew his sword from its sheath, recited verses and killed him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18471