Sayyiduna Khuraym bin Aws (may Allah be pleased with him) said: There was no one more hostile to the Arabs than Hurmuz. When we had finished with Musaylimah and his companions, we set out towards the region of Basrah, and Hurmuz met us at Kazimah with a huge host. Khalid (may Allah be pleased with him) came out against him and called for single combat, so Hurmuz came out against him, and Khalid killed him. He wrote of this to Abu Bakr al-Siddiq (may Allah be pleased with him), who awarded him (Hurmuz's) spoils as a bonus: the cap of Hurmuz, worth one hundred thousand dirhams. It was the custom of the Persians that when a man among them attained high rank, they would make him a cap worth one hundred thousand dirhams.
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3788