1 Samuel 10:8

Till I come - This, though now mentioned and commanded, was not immediately to be performed; as is evident, partly from the whole course of the story, (which shews, that Saul and Samuel, and the people, first met at Mizpeh, I Samuel 10:17, etc. where Saul was chosen by God, and accepted by the people as king; and afterwards went to Gilgal once before the time here spoken of, I Samuel 11:14-15,) and partly, by comparing this place with I Samuel 13:8, etc. where we find Saul charged with the violation of this command, two years after the giving of it. It seems this is given as a standing rule for Saul to observe while Samuel and he lived; that in case of any great future difficulties, as the invasion of enemies, Saul should resort to Gilgal, and call the people thither, and tarry there seven days, which was but a necessary time for gathering the people, and for the coming of Samuel thither. And Gilgal was chosen for this purpose, because that place was famous for the solemn renewing of the covenant between God and Israel, Joshua 4:19-24, and for other eminent instances of God's favour to them, the remembrance whereof was a confirmation of their faith; and because it was a very convenient place for he tribes within and without Jordan to assemble, and consult, and unite their forces together upon such occasions.