And whoever in the open field touches one who is slain with a sword, or a dead body, or a bone of a man, or a grave, shall be unclean seven days.
Torah Temimah: Yerushalmi Nazir 7:2 — A hint for a spoonful of dust (from a decomposed corpse) that conveys impurity: the colleagues said, rearrange the verse — “or a grave” [can be read] “or dust.”
Sefaria — Yerushalmi Nazir 7:2
English: A hint for a spoonful of dust (from a decomposed corpse) that conveys impurity: the colleagues said, rearrange the verse — “or a grave” [can be read] “or dust.”
Derash by rearranging the letters of the verse.
A spoonful of dust from a fully decomposed corpse (terod rekav) conveys impurity.