This man represents someone whom we despise, and he has killed many of our noblemen. Will you allow me to kill him in revenge?
Amr sought the Najashi's permission to kill Amr ibn Umayyah al-Damri, the Prophet ﷺ's envoy, not knowing the Najashi was secretly a Muslim.
I did not know you would get so angry: if I had known, I would never have asked this of you.
The Najashi struck his hand on his own nose in a sign of anger and disgust at the request.
Do you wish me to deliver into your hands the envoy of the one whom the Great Spirit descends upon? O Amr, woe to you! Obey me in this, and follow this man: for he is upon the Truth, and he will surely be victorious over his enemies, just as Musa was victorious over Pharaoh.
Will you accept my Islam on behalf of the Messenger of Allah ﷺ?
The Najashi accepted, and Amr gave his bay'ah for Islam to the Najashi there and then.