Burayda reported,

When the Messenger of Allah ﷺ encamped at the fortress of the people of Khaybar, he handed the banner to Umar bin Khattab, and a group of the Muslims set out with him. They engaged the people of Khaybar in battle.The Messenger of Allah ﷺ then said, "Tomorrow I shall give the banner to a man who loves Allah and His Messenger, and whom Allah and His Messenger love."The next day, he called for Ali, who was suffering from sore eyes. He spat into his eyes, handed him the banner, and the people set out with him. Ali met the people of Khaybar, and there was Marhab striding before them, chanting,"Khaybar knows well that I am Marhab, fully armed, a tested warrior bold. Sometimes I thrust, and sometimes I strike, when the lions advance, blazing in fury."He and Ali exchanged two blows, and Ali struck him on the crown of his head until the sword bit into his teeth. The people of the camp heard the sound of the blow. The last of the men had not yet caught up with Ali before the fortress was opened for him and for them.

حدثنا محمد بن جعفر وروح المعنى قالا حدثنا عوف عن ميمون أبي عبد الله قال روح الكردي عن عبد الله بن بريدة

عن أبيه بريدة الأسلمي قال

لما نزل رسول الله ﷺ بحصن أهل خيبر أعطى رسول الله ﷺ اللواء عمر بن الخطاب ونهض معه من نهض من المسلمين فلقوا أهل خيبر فقال رسول الله ﷺ لأعطين اللواء غدا رجلا يحب الله ورسوله ويحبه الله ورسوله فلما كان الغد دعا عليا وهو أرمد فتفل في عينيه وأعطاه اللواء ونهض الناس معه فلقي أهل خيبر وإذا مرحب يرتجز بين أيديهم وهو يقول لقد علمت خيبر أني مرحب شاكي السلاح بطل مجرب أطعن أحيانا وحينا أضرب إذا الليوث أقبلت تلهب قال فاختلف هو وعلي ضربتين فضربه على هامته حتى عض السيف منها بأضراسه وسمع أهل العسكر صوت ضربته قال وما تتام آخر الناس مع علي حتى فتح له ولهم