Jamieson, Fausset and Brown on 1 Samuel 10:5

5. the hill of God--probably Geba (1Sa 13:3), so called from a school of the prophets being established there. The company of prophets were, doubtless, the pupils at this seminary, which had probably been instituted by Samuel, and in which the chief branches of education taught were a knowledge of the law, and of psalmody with instrumental music, which is called "prophesying" (here and in 1Ch 25:1, 7).