Joshua 8:29
28 Joshua burned Ai and made it a permanently uninhabited mound (it remains that way to this very day). 29 He hung the king of Ai on a tree, leaving him exposed until evening. At sunset Joshua ordered that his corpse be taken down from the tree. They threw it down at the entrance of the city gate and erected over it a large pile of stones (it remains to this very day). 30 Then Joshua built an altar for the Lord God of Israel on Mount Ebal,
LXX Joshua 8:29
28 And Joshua burned the city with fire. He made it an uninhabitable mound for eternity up to this day. 29 And the king of Ai, he hung on a forked tree, and he was on the tree until evening; and as the sun set, Joshua gave instructions, and they took down his body from the tree and threw him into a pit and placed over him a heap of stones until this day.
Notes and References
"... The Hebrew ‘ēs., “tree,” is clarified in the Septuagint as being a “forked tree” (xulou didymou), suggesting some form of gallows. The LXX plus “probably reflects an expansion introduced by the Greek translator to underline this specific type of punishment” ..."
Dozeman, Thomas B. The Anchor Yale Bible: Joshua 1-12 (p. 371) Yale University Press, 2015