'Oil' in the Bible

Then Samuel took the vial of oil, and poured it on his head, and kissed him, and said, "Isn't it that Yahweh has anointed you to be prince over his inheritance?

Yahweh said to Samuel, "How long will you mourn for Saul, since I have rejected him from being king over Israel? Fill your horn with oil, and go. I will send you to Jesse the Bethlehemite; for I have provided a king for myself among his sons."

Then Samuel took the horn of oil, and anointed him in the midst of his brothers: and the Spirit of Yahweh came mightily on David from that day forward. So Samuel rose up, and went to Ramah.