Submit to Islam and be safe. Or agree to the payment of the Jizya (tax), and you and your people will be under our protection, else you will have only yourself to blame for the consequences, for I bring the men who desire death as ardently as you desire life.

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Source, in full

This letter was written by Khalid, from his head-quarters in Babylonia, to the Persian monarch Emperor Yazdegerd III before invading it. (History of the World, Volume IV [Book XII. The Mohammedan Ascendency], page 463, by John Clark Ridpath, LL.D. 1910.

Attribution

Quote text and notes from Wikiquote: Khalid ibn al-Walid (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.