Matthew Poole and continuators on Joshua 7:13

13 Up, sanctifie the people, and say, Sanctifie your selves against to morrow: for thus saith the LORD God of Israel, There is an accursed thing in the midst of thee, O Israel: thou canst not stand beforeth me enemies, until ye take away the accursed thing from among you.

Purify your selves from that desilement which you have all in some sort contracted by this accursed fact, and prepare your selves to appear before the Lord, as it is most probable they were required to do; as imploring and expecting the Sentence of God for the Discovery and Punishment of the Sin, and that the guilty person might hereby be awakened and terrified, and brought to a free and seasonable confession of his fault. And it is a marvellous thing that Achan did not on this occasion acknowledg his Crime; but this is to be imputed partly to the heart-hardening power of Sin, which makes men grow worse and worse; partly to his Pride, being loath to take to himself the shame of such a mischievous and infamous action; partly to his self-flattering and vain conceit, whereby he might think many others were guilty as well as he, and some of them might be taken, and he escape; and partly to the just Judgment of God, whereby he blinds and hardens Sinners to their own ruine. See a like instance, Mat. 26. 21, 22, 25.