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: Chullin 72a — Rabbi Akiva says: “And whoever touches on the face of the field” — to include the covering stone (golel) and the supporting stone (dofek).
English: Rabbi Akiva says: “And whoever touches on the face of the field” — to include the covering stone (golel) and the supporting stone (dofek).
Inclusion of the stones that cover and support a grave.
Contact with the covering stone or the supporting stone of a grave conveys the same seven-day impurity as contact with the corpse itself.