Moses continues speaking to the people of Israel as if he were speaking to one man, so the words "you" and "your" are singular. (See: [[rc://en/ta/man/translate/figs-you]])
This can be stated in active form. AT: Possible meanings are 1) "because God curses everyone whom people hang on trees" and 2) "people hang on trees those whom God has cursed." (See: [[rc://en/ta/man/translate/figs-activepassive]])
# do not defile the land
by leaving something God has cursed hanging in the tree