1 Samuel 13:7-9

7Some of them crossed the Jordan River and escaped into the land of Gad and Gilead. Meanwhile, Saul stayed at Gilgal, and his men were trembling with fear.

8Saul waited there seven days for Samuel, as Samuel had instructed him earlier, but Samuel still didn’t come. Saul realized that his troops were rapidly slipping away.

9So he demanded, “Bring me the burnt offering and the peace offerings!” And Saul sacrificed the burnt offering himself.