Committed a trespass - (compare Lev 5:15 note), “acted treacherously and committed a breach of faith.” This suitably describes the sin of Achan, who had purloined and hidden away that which had been dedicated to God by the ban Jos 6:19.
The “trespass” was the act of one man, yet is imputed to all Israel, who also share in the penalty of it Jos 7:5. This is not to be explained as though all the people participated in the covetousness which led to Achan’s sin Jos 7:21. The nation as a nation was in covenant with God, and is treated by Him not merely as a number of individuals living together for their own purposes under common institutions, but as a divinely-constituted organic whole. Hence, the sin of Achan defiled the other members of the community as well as himself. and robbed the people collectively of holiness before God and acceptableness with Him. Israel had in the person of Achan broken the covenant Jos 7:11; God therefore would no more drive out the Canaanites before them.
The accursed thing - Rather “in that which had been devoted or dedicated.” Achan in diverting any of these devoted things to his own purposes, committed the sin of sacrilege, that of Ananias and Sapphira. Act 5:2-3.
Achan or Achar - (the marginal reference) the “n” and “r” being interchanged, perhaps for the sake of accommodating the name to עכר ‛âkar, “trouble” Jos 7:25. Zabdi is generally identified with the Zimri of 1Ch 2:6. Zerah was twin brother of Pharez and son of Judah Gen 38:30. In this genealogy, as in others, several generations are omitted, most likely those which intervened between Zerah and Zabdi, and which covered the space between the migration of Jacob’s household to Egypt and the Exodus. (Num 26:5, see the note).