Contradiction with 2 Samuel 24:18
In 2 Samuel, Gad tells David to go up and build an altar to the Lord on the threshing floor of Araunah the Jebusite, whereas 1 Chronicles describes Gad's instructions slightly differently, leading to various interpretations and perceived contradictions in the events or instructions given to David.
2 Samuel 24:18: And Gad came that day to David, and said unto him, Go up, rear an altar unto the LORD in the threshingfloor of Araunah the Jebusite. [Araunah: Heb. Araniah]
Paradox #1
The contradiction noted with 1 Chronicles 21:19 often pertains to differences between this account and its parallel story in 2 Samuel 24. Both chapters describe the same event—David purchasing a threshing floor to build an altar. However, there are inconsistencies in details, such as who sold the threshing floor and the price paid, which can cause confusion when comparing the two accounts.