Saul was rejected as King over Israel because he disobeyed God's command to utterly destroy the
Answer Details
Saul was rejected as King over Israel because he disobeyed God's command to utterly destroy the Amalekites. According to the Bible, God commanded Saul to destroy the Amalekites and everything that belonged to them, as they had opposed the Israelites when they came out of Egypt. However, Saul spared the Amalekite king and kept some of their valuable possessions, going against God's command.
As a result, God was displeased with Saul's disobedience and regretted making him king. God then chose David, a man after His own heart, to be the next king of Israel.