5 After that you shall come to Gib'e-ath-elo'him, where there is a garrison of the Philistines; and there, as you come to the city, you will meet a band of prophets coming down from the high place with harp, tambourine, flute, and lyre before them, prophesying. 6 Then the spirit of the Lord will come mightily upon you, and you shall prophesy with them and be turned into another man. 7 Now when these signs meet you, do whatever your hand finds to do, for God is with you. 8 And you shall go down before me to Gilgal; and behold, I am coming to you to offer burnt offerings and to sacrifice peace offerings. Seven days you shall wait, until I come to you and show you what you shall do."
9 When he turned his back to leave Samuel, God gave him another heart; and all these signs came to pass that day. 10 When they came to Gib'e-ah, behold, a band of prophets met him; and the spirit of God came mightily upon him, and he prophesied among them. 11 And when all who knew him before saw how he prophesied with the prophets, the people said to one another, "What has come over the son of Kish? Is Saul also among the prophets?" 12 And a man of the place answered, "And who is their father?" Therefore it became a proverb, "Is Saul also among the prophets?" 13 When he had finished prophesying, he came to the high place.
Matthew Henry's Commentary on 1 Samuel 10:5-13
Commentary on 1 Samuel 10:1-8
(Read 1 Samuel 10:1-8)
The sacred anointing, then used, pointed at the great Messiah, or Anointed One, the King of the church, and High Priest of our profession, who was anointed with the oil of the Spirit, not by measure, but without measure, and above all the priests and princes of the Jewish church. For Saul's further satisfaction, Samuel gives him some signs which should come to pass the same day. The first place he directs him to, was the sepulchre of one of his ancestors; there he must be reminded of his own mortality, and now that he had a crown before him, must think of his grave, in which all his honour would be laid in the dust. From the time of Samuel there appears to have been schools, or places where pious young men were brought up in the knowledge of Divine things. Saul should find himself strongly moved to join with them, and should be turned into another man from what he had been. The Spirit of God changes men, wonderfully transforms them. Saul, by praising God in the communion of saints, became another man, but it may be questioned if he became a new man.
Commentary on 1 Samuel 10:9-16
(Read 1 Samuel 10:9-16)
The signs Samuel had given Saul, came to pass punctually; he found that God had given him another heart, another disposition of mind. Yet let not an outward show of devotion, and a sudden change for the present, be too much relied on; Saul among the prophets was Saul still. His being anointed was kept private. He leaves it to God to carry on his own work by Samuel, and sits still, to see how the matter will fall.