How do we know David was anointed by God?

David being chosen as the anointed one is a significant biblical truth that is articulated in 1 Samuel 16:13. Here, Samuel anoints David with oil in the presence of his brothers and from that point onward, the Spirit of the Lord comes powerfully upon David. This act of anointing signifies that David was not elected due to his notable abilities or characteristics but by God's sovereign choice. David's life showcases the workings of God's providence, leading him from a humble shepherd boy to the king of Israel, emphasizing that it was God's grace and will that raised him to such a position.