1 Samuel 14:39

He shall surely die. With despotic violence, without waiting to learn what the offence was, and judging simply by consequences, because he was delayed in following up the pursuit, he takes a solemn oath that the offending person shall be put to death. Thus twice in the same day he was guilty of the sin of rash swearing. The people condemn him by their silence. They had obeyed him with ready devotion; but now they listen in terror to the rash and violent words which condemn to death the young hero by whom God had that day wrought deliverance for them.