1 Kings 1:34

Anoint him there king; as they used to do where there was any thing new, or doubtful, or extraordinary in the succession, as 1 Samuel 10:1, 1 Samuel 16:12,13 1 Kings 19:15,16 2 Kings 9:3. And this unction signified both the designation of the persons to the office, and the gifts and graces which were necessary for their office, and which they, seeking them sincerely from God, might expect to receive. Blow ye with the trumpet; to make the action more solemn, and glorious, and public.