Numbers 19:16

Overview - Numbers 19
The water of separation made of the ashes of a red heifer.
11 The law for the use of it in purification of the unclean.
Treasury of Scripture Knowledge

Numbers 19:16  (King James Version)
And whosoever toucheth one that is slain with a sword in the open fields, or a dead body, or a bone of a man, or a grave, shall be unclean seven days.

11 ; 31:19

a bone
Ezekiel 39:11-16

a grave
Matthew 23:27 ; Luke 11:44