Divrey Hayamim Alef 20:1-2

Orthodox Jewish Bible

20 And it came to pass, at the time of eshuvat hashanah, at the time that melachim go out to battle, Yoav led forth the chayl hatzava, and laid waste the eretz Bnei Ammon, and came and besieged Rabbah. But Dovid tarried at Yerushalayim. And Yoav struck Rabbah, and destroyed it.

² And Dovid took the ateret of their melech from off his rosh, and found it to weigh a talent of zahav, and there were precious stones in it; and it was set upon rosh Dovid; and he brought also exceeding much plunder out of the Ir.