What does the Bible say about Saul's disobedience?

In 1 Samuel, Saul's disobedience is illustrated by his failure to wait for God’s command and to carry out God’s instructions fully. Samuel rebukes Saul for his actions, stating that because Saul has not kept the commandment of God, his kingdom will not endure (1 Samuel 13:13-14). This reflects the principle that attempts at self-righteousness, like Saul's partial obedience, lead only to ruin. The narrative serves as a warning that trusting in one's own strength rather than in God's wisdom ultimately results in death and separation from God.