Dialogue between Hazrat Khalid ibn al-Walid and Jarja in Yarmouk

The Battle of Yarmouk was fought between Muslim forces and the Eastern Roman Empire on August 12, 636, Rajab 5, 15 Hijri. Muslim army was led by Khalid ibn al-Walid in the battle field but just before the start of battle on day one, one of the noble warriors of the Roman army Jarja came forward and asked for Hazrat Khalid.
Khalid ibn al-Walid came forward to talk to him and following dialogue took place between the two.

Jarja: I hope, you will tell me the truth?

Khalid ibn al-Walid: no doubt, because in our religion telling a lie is forbidden and God has cursed the liars.

Jarja: I have heard that a sword has descended on you Prophet and he has given that sword to you. With that sword you go into battles and win by the grace of it?

Khalid ibn al-Walid: no, itís not true.

Jarja: Then why are you called the Sword of God (Saif Allah) and you kept winning wars all the time?

Khalid ibn al-Walid: God has sent us a Prophet among us. In the beginning, I didnít believe him, I even fought against him. Then God guided me to a true path and I became a Muslim. Then Holy Prophet prayed for me and said that I am the Sword of God and I will always be a winner against non-believers.

Jarja: Ok, why did you come to fight us?

Khalid ibn al-Walid: You people had forgotten God and donít accept his Prophet. You either convert to Islam or submit to us and pay taxes. If you didnít like these two options, then get ready for fight.

Jarja: When someone accepts your invitation (converts), how is he treated?

Khalid ibn al-Walid: We are all like brothers. No one is better than others. Rich and poor all are equal in eyes of Islam.

Jarja: Would that person (convert) be rewarded too?

Khalid ibn al-Walid: God is not hypocrite, the one, who has a clear conscious and enters Islam, will be bestowed by God in this life and the one after life.

After listening to this Jarja requested to be converted. After reciting shahada, he came out and fought alongside Hazrat Khalid ibn al-Walid in the battle.

(Ref. Ibn Khaldun, V2)