The election of David was obvious from what happened with the holy oil with which he was anointed. When Samuel had tried to pour the oil on David's brothers, it had remained in the horn, but at David's approach it flowed of its own accord, and poured itself out over him. The drops on his garments changed into diamonds and pearls, and after the act of anointing him, the horn was as full as before.
The amazement was great that the son of a slave should be made king. Then the wife of Jesse revealed her secret, and declared herself the mother of David.