1 Samuel 13:12

Now this we all in common do charge you, that every one remain in that rank which is appointed him, and do not transgress his proper bounds; for they are not ours but God's.… And those things which are allotted for the high priests to do, those might not be meddled with by the priests; and what things were allotted to the priests, the Levites might not meddle with; but every one observed those ministrations which were written down and appointed for them. And if any would meddle beyond the tradition, death was his punishment. And Saul's example does show this most plainly, who, thinking he might offer sacrifice without the prophet and high priest Samuel, drew upon himself a sin and a curse without remedy. Nor did even his having anointed him king discourage the prophet.

Saul also was dishonored because he did not wait for Samuel the high priest. It behooves you, therefore, also to reverence your superiors.

And mark it, he [the devil] desired to bring Saul into [the] superstition of witchcraft. But if he had counseled this at the beginning, the other would not have given heed; for how should he, who was even driving them out? Therefore gently and by little and little he leads him on to it. For when he had disobeyed Samuel and had caused the burnt offering to be offered, when he was not present, being blamed for it, he says, "The compulsion from the enemy was too great," and when he ought to have bewailed, he felt as though he had done nothing.Again God gave him the commands about the Amalekites, but he transgressed these too. Then he proceeded to his crimes about David, and thus slipping easily and little by little he did not stop, until he came to the very pit of destruction and cast himself in.

17. Behold, he who is accused of the recklessness of a great transgression is not afraid to assert great reasons of justice. "I saw," he says, "that the people were slipping away from me." Here he asserts that he was abandoned by the people. "Furthermore, you had not come within the appointed days." Here he shows himself cheated of the prophet's promise. "Furthermore, the Philistines had gathered at Michmash." Here he likewise brings up the imminent danger of battle. Therefore, drawing a conclusion from his own action, he says: "Compelled by necessity, I offered the burnt offering." As if to say: You accuse me of a great offense, when the offense is so much lighter inasmuch as it was committed not from recklessness but from necessity. But what the prophet recognizes him to be—he who was unwilling to recognize himself—he adds, saying...

I said: Now the Philistines will come down upon me to Gilgal, etc. The Pharisees and scribes, fearing that they might be either submerged by demons or in the mire of vices, or rendered useless in the revelation of the given law, began to have a zeal for God, but not according to knowledge; and as the Psalmist testifies, "There they were in great fear, where no fear was" (Psalm 52).