C. F. Keil and Franz Delitzsch on Joshua 7:10

Jos 7:10

The answer of the Lord, which was addressed to Joshua directly and not through the high priest, breathed anger against the sin of Israel. The question, “Wherefore liest thou upon thy face?” (“fallest,” as in Deu 21:1) involved the reproof that Joshua had no reason to doubt the fidelity of the Lord. Instead of seeking for the cause of the calamity in God, he ought to seek it in the sin of the people.