1 Samuel 10:8

thou shalt go down before me to Gilgal Better, and when thou goest down before me to Gilgal. This is not to be understood as a direction to meet Samuel at Gilgal at once. The injunction applies to some future occasion whenever it might be, of which they had been talking. Doubtless Samuel and Saul had been discussing the best means of shaking off the Philistine yoke, and had agreed upon a muster of the people at Gilgal, as the national centre furthest from the Philistine power. Samuel's parting injunction to Saul is to take no step independently. The king must wait for the prophet's sanction to strike the blow. The fitting opportunity for the muster did not come for several years, and when it came Saul disobeyed Samuel's command. See 1 Samuel 13:8 ff.