The prophet Samuel sets forth a complex set of instructions that serves as a fateful touchstone for a newly established monarchy. It is not merely a practical itinerary, but a profound test of obedience and patience. Saul is directed to travel down to Gilgal ahead of Samuel [רש"י, מצודת דוד]. This destination is meant to be reached after Saul is officially made king, serving as the location where his royal authority will be publicly renewed and cemented. Samuel guides Saul directly to this site, where the coronation will be finalized beyond any doubt with a large public sacrifice, intentionally omitting any mention of stops along the journey [אברבנאל, ביאור שטיינזלץ].
Once the kingship is established at Gilgal, the next phase involves a period of waiting before the war against the Philistines. At this stage, Samuel and Saul will part ways, and Samuel will leave the area. From the exact day of their separation, Saul is required to remain in Gilgal and wait seven full days for the prophet to return [רד"ק, מלבי"ם, אברבנאל]. Upon his return at the end of this period, Samuel will offer burnt offerings to God. He will then fulfill his promise to provide Saul with exact instructions on how to manage the upcoming war and guide his kingdom [מצודת דוד, ביאור שטיינזלץ].
One might wonder why Samuel issues this strict command to wait right from the start, rather than waiting until they actually separate at Gilgal. This directive is actually Saul's first and most crucial commandment as king, acting as an absolute condition for his continued reign. Although Saul was previously granted general permission to act according to his own understanding, at Gilgal, his right to act independently is taken away [מלבי"ם]. The stakes are clear. If Saul passes this test by waiting patiently, his kingdom will survive, and Samuel will reveal its future. However, if he disobeys and fails to wait, he will provoke anger, face severe consequences, and ultimately lose his right to rule [רד"ק, מצודת דוד].