When Samuel is about to anoint Saul he requests that the servant go ahead whilst they remain behind
KJV 1 Samuel 9 : 27
And as they were going down to the end of the city, Samuel said to Saul, Bid the servant pass on before us, (and he passed on,) but stand thou still a while, that I may shew thee the word of God.
Immediately after bidding the servant to leave Samuel turns around and anoints Saul as king.
KJV 1 Samuel 10 : 1
Then Samuel took a vial of oil, and poured it upon his head, and kissed him, and said, Is it not because the LORD hath anointed thee to be captain over his inheritance?
Why did Samuel hide the anointing from the servant?