397 - the Red Cow - to use its ashes for purification from Tumah.
398- laws of Tumah from the dead - it lasts 7 days etc.
399 - A pure person has to apply the process.
We learn that to live properly we need to avoid the dead which is symbolic of those who refuse to choose a life of Torah & Mitzvos.
Now may be a good time for a gem of Torah study.
www.GemsofTorah.com