Then Joshua tore his clothes, and fell to the earth on his face before the ark of the LORD until evening, he and the elders of Israel; and they put dust on their heads.
Joshua 7:6
Surrounding context
7:5 And the men of Ai struck down about thirty-six men, for they chased them from before the gate as far as Shebarim, and struck them down on the descent; therefore the hearts of the people melted and became like water.
7:6 Then Joshua tore his clothes, and fell to the earth on his face before the ark of the LORD until evening, he and the elders of Israel; and they put dust on their heads.
7:7 And Joshua said, "Alas, Lord GOD, why have You brought this people over the Jordan at all--to deliver us into the hand of the Amorites, to destroy us? Oh, that we had been content, and dwelt on the other side of the Jordan!