Sa'd ibn 'Abdullah narrated from Ayyub ibn Nuh, from some of our companions, from Abu 'Abdillah عليه السلام: Imam عليه السلام said: "If a piece is severed from a man's body, it is considered a dead body (maytah). If someone touches it, then any part of it that contains bone requires ghusl for the one who touches it. However, if it does not contain bone, then no ghusl is required."