Leviticus 21:10 "And he that is High priest among his brothers, upon whose head the anointing oil was poured"

Crowning a king, electing a president and appointing a leader are special occasions.

So, too, the High Priest and Jewish kings are anointed in a unique manner.

Specially prepared oil is used to ordain them, as the chosen, to lead our people in the service of HaShem.

Just as oil rises to the top in a liquid mixture, these leaders are uplifted to high positions as commanded by HaShem.

This Positive Mitzvah requires us to have this oil ready to be used for these purposes.