9 Saul turned and left Samuel. At that very moment God transformed him - made him a new person! And all the confirming signs took place the same day. 10 When Saul and his party got to Gibeah, there were the prophets, right in front of them! Before he knew it, the Spirit of God came on Saul and he was prophesying right along with them.
Matthew Henry's Commentary on 1 Samuel 10:9-10
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.