And the Spirit of the LORD will come upon thee, and thou shalt prophesy with them, and shalt be turned into another man.

Wesley's Notes

10:6 Will come - Heb. will leap, or rush upon thee. Another man - That is, thou shalt be suddenly endowed with another spirit, filled with skill of divine things, with courage, and wisdom, and magnanimity; and other qualifications befitting thy dignity.

Jamieson-Fausset-Brown Bible Commentary

6. the Spirit of the Lord will come upon thee-literally, "rush upon thee," suddenly endowing thee with a capacity and disposition to act in a manner far superior to thy previous character and habits; and instead of the simplicity, ignorance, and sheepishness of a peasant, thou wilt display an energy, wisdom, and magnanimity worthy of a prince.

Matthew Henry's Concise Commentary

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.