As soon as he had finished offering the burnt offering, behold, Samuel came. And Saul went out to meet him and greet him.
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 Sa1 10:8.
Commenting on 1 Samuel 13:8-14
And it came to pass, that as soon as he had made an end of offering the burn offering,.... And before he could offer the peace offerings: behold, Samuel came; and it was told Saul that he was come: and Saul went out to meet him; left off sacrificing, and would proceed no further, leaving the rest for Samuel and out of respect to him...
Behold, Samuel came - Samuel was punctual to his appointment; one hour longer of delay would have prevented every evil, and by it no good would have been lost. How often are the effects of precipitation fatal!