Achan was an Israelite from the tribe of Judah who violated God's command by taking devoted things from the conquered city of Jericho (Jos. 7:1). His sin caused Israel's defeat in the battle against Ai. When Joshua sought the Lord's guidance, God revealed that someone had stolen from the devoted things (Jos. 7:10-15).
Through a process of elimination, Achan was identified as the culprit (Jos. 7:16-18). He confessed to taking a beautiful cloak from Shinar, silver, and gold, hiding them in his tent (Jos. 7:19-21). As a result, Achan and his family were stoned to death, and their remains were burned (Jos. 7:24-25). The place where this occurred was named the Valley of Achor, meaning "trouble" (Jos. 7:26). Achan's sin and its consequences were remembered as a warning against unfaithfulness to God (Jos. 22:20).
Article: STEPBible, Tyndale House Cambridge · CC BY 4.0