John Gills Exposition of the Bible Commentary - 1 Samuel 13:13
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... read more
Matthew Henry's Complete Commentary - 1 Samuel 13:8-14
Here is, I. Saul's offence in offering sacrifice before Samuel came. Samuel, when he anointed him, had ordered him to tarry for him seven days in Gilgal, promising that, at the end of those days, he would be sure to come to him, and both offer sacrifices for him and direct him what he should do. This we had 1 Sam. 10:8. Perhaps that order, though inserted there, was given him afterwards, or was given him as a general rule to be observed in every public congress at Gilgal, or, as is most... read more