'Unfaithful' in the Bible

The Israelites, however, were unfaithful regarding the things set apart for destruction. Achan son of Carmi, son of Zabdi, son of Zerah, of the tribe of Judah, took some of what was set apart, and the Lord’s anger burned against the Israelites.

Wasn’t Achan son of Zerah unfaithful regarding what was set apart for destruction, bringing wrath on the entire community of Israel? He was not the only one who perished because of his sin.’”