Samuel took a vial of oil and poured it on his head, and kissed him; he said, "The Lord has anointed you ruler over his people Israel. You shall reign over the people of the Lord and you will save them from the hand of their enemies all around. Now this shall be the sign to you that the Lord has anointed you ruler over his heritage:
References for 1 Samuel 10:1
When you depart from me today you will meet two men by Rachel's tomb in the territory of Benjamin at Zelzah; they will say to you, "The donkeys that you went to seek are found, and now your father has stopped worrying about them and is worrying about you, saying: What shall I do about my son?'
Then you shall go on from there further and come to the oak of Tabor; three men going up to God at Bethel will meet you there, one carrying three kids, another carrying three loaves of bread, and another carrying a skin of wine.
They will greet you and give you two loaves of bread, which you shall accept from them.
After that you shall come to Gibeath-elohim, at the place where the Philistine garrison is; there, as you come to the town, you will meet a band of prophets coming down from the shrine with harp, tambourine, flute, and lyre playing in front of them; they will be in a prophetic frenzy.
References for 1 Samuel 10:5
Then the spirit of the Lord will possess you, and you will be in a prophetic frenzy along with them and be turned into a different person.
Now when these signs meet you, do whatever you see fit to do, for God is with you.