And Samuel said to Saul, thou hast done foolishly
Not by intruding himself into the priest's office, with that he is not charged, but not waiting the full time till Samuel came; which showed his impatience, disregard to Samuel, and distrust of God; and though he thought he had acted wisely, and taken the proper precautions in his circumstances, yet he acted foolishly; and though a king, Samuel being a prophet of the Lord, and in his name, spared not to tell him so:
thou hast not kept the commandment of the Lord thy God, which he
commanded thee;
by his prophet, that he should wait seven days for his coming, who would then offer sacrifices, and tell him what he should do; and not to keep the commandment of God was acting a foolish part:
for now would the Lord have established thy kingdom upon Israel for
ever;
that is, for a long time, on his son, and son's son; and then, according to promise and prophecy, it would come to one of the tribe of Judah; but now seeing he had acted such a part, it should not continue long in his family, no longer than his own life, and quickly come into other hands.