(7:5) "And the men of Ai smote them."

(7:6) "And Joshua rent his clothes, and fell ... upon his face ... until the eventide, he and the elders of Israel, and put dust upon their heads."
And they fell on their faces (FOF)
The put dust on their heads.

(7:8) "O LORD, what shall I say, when Israel turneth their backs before their enemies!"

(7.9) “For the Canaanites and all the inhabitants of the land shall hear of it.” What will the neighbors say? Joshua worries that neighboring tribes will make fun of them for being defeated by the Amorites.

(7:10) "And the LORD said unto Joshua, Get thee up; wherefore liest thou thus upon thy face?"

(7:11-13)
God tells Joshua to kill whoever took "the accursed thing."

(7:11) "Israel hath sinned ... they have even taken of the accursed thing ... and they have put it even among their own stuff."

(7:12) "The children of Israel could not stand before their enemies ... because they were accursed: neither will I be with you any more, except ye destroy the accursed from among you."

(7:13) "There is an accursed thing in the midst of thee, O Israel: thou canst not stand before thine enemies, until ye take away the accursed thing from among you."

(7:14-18) So God helped find the guy with the accursed thing. First he identified the tribe (Judah), then the family (Zarhites), then the household (Zabdi), and finally the man who took the accursed thing (Achan).

(7:14) "The tribe which the LORD taketh shall come according to the families thereof; and the family which the LORD shall take shall come by households; and the household which the LORD shall take shall come man by man."

(7:15) "He that is taken with the accursed thing shall be burnt with fire, he and all that he hath."
What the Bible says about burning people to death

(7:16) "So Joshua ... brought Israel by their tribes; and the tribe of Judah was taken."

(7:17) "And he brought the family of Judah; and he took the family of the Zarhites: and he brought the family of the Zarhites man by man; and Zabdi was taken."

(7:18) "And he brought his household man by man; and Achan ... was taken."

(7:19-26) Joshua suggested that Achan confess, which he did. Then everyone stoned and burned him and his family to death, thereby, turning God "from the fierceness of his anger."

(7:19) "Joshua said unto Achan, My son ... tell me now what thou hast done; hide it not from me."

(7:20) "And Achan ... said, Indeed I have sinned against the LORD God of Israel, and thus and thus have I done."

(7:21) "When I saw among the spoils a goodly Babylonish garment, and two hundred shekels of silver, and a wedge of gold of fifty shekels weight, then I coveted them, and took them; and, behold, they are hid in the earth in the midst of my tent, and the silver under it."