So Aaron took it as Moses said and ran into the midst of the assembly. And behold, the plague had already begun among the people. And he put on the incense and made atonement for the people. And he stood between the dead and the living, and the plague was stopped.
Numbers 16:47-48

Death is the source of all uncleanness, and it is vital that God's people maintain a separation from death whenever possible. It is not to be glorified, celebrated, or wallowed in. We are to make a distinction between the clean and the unclean, between the living and the dead.

For God has not called us for uncleanness, but in holiness. Therefore whoever disregards this, disregards not man but God, who gives his Holy Spirit to you.
1 Thessalonians 4:7-8