(Saul has recently been declared unworthy of his position)

Nevertheless, Samuel mourned for Saul...

Now the Lord said to Samuel, How long will you mourn for Saul, seeing I have rejected him from reigning over Israel?  Fill your horn with oil, and go; I am sending you to Jesse the Bethlehemite.  For I have provided myself a king among His sons.


(You know how the story goes from there. If not, I strongly suggest you look it up.)