Defilement: Ceremonial Caused by Touching a Dead Body or a Bone

But there were some men who were unclean due to a dead body, so they could not observe the Passover on that day. And they came before Moses and Aaron that same day

…and said to Moses, “We are unclean because of a dead body, but why should we be excluded from presenting the LORD’s offering with the other Israelites at the appointed time?”

Whoever touches any dead body will be unclean for seven days.

Anyone in the open field who touches someone who has been killed by the sword or has died of natural causes, or anyone who touches a human bone or a grave, will be unclean for seven days.