Defilement: Ceremonial Caused by Touching a Dead Body or a Bone
Source: TTT
Numbers 9:6, 7
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?”
Numbers 19:11, 16
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.