The prophet Samuel: You also must obey the LORD—you must worship him with all your heart and remember the great things he has done for you. 1 Samuel 12:24

The First Book of Samuel recounts a very important period in the history of Israel after the arrival in the land of Canaan with Moses, the transition from the aristocracy of the judges to the first monarchy of Israel with Saul.
The institution of judges had been created by the prophet Moses following the advice of his father-in-law Jethro during the journey to the promised land, and after the death of Joshua, the judges had a very important role because in addition to doing justice, these aristocrats freed the Israelites from their oppressors like the Philistines and the Midianites.
But over time the Israelites began to adopt the customs of the people around them, and so, in pursuit of the most important good, which is the gift of peace, the Israelites approached the prophet Samuel to ask him to anoint a king. The prophet Samuel consulted God and having received the Lord's approval, Samuel complied with what was requested and thus anointed Saul, a person of great presence and countenance, as the first king of the nation of Israel.
But the prophet also knew that this request that the Israelites moved by the passion of fear asked him was a sin because as the Bible teaches the only king is the Lord. And so Samuel, like every judge and prophet of the Lord, prepared to give an important speech to the Israelites to move them towards their God and so that they would remain faithful to the covenant made with the creator of all things.
And so with these words, Samuel reminded the Israelites of the first commandment, the beginning of the covenant with God: "Don't go back to worshiping worthless idols that cannot help or rescue you—they are totally useless!" 1 Samuel 12:21.
And then the prophet reminded them of the foundation of the law of Moses, the spiritual gift of fear of God (constancy, firmness, devotion, and equanimity), because without this gift the whole law is a dead letter: "You also must obey the LORD—you must worship him with all your heart and remember the great things he has done for you" 1 Samuel 12:24.
Prophets like Samuel are a constant reminder of man's ethical and moral obligations, because without their fulfillment men have neither future nor blessing, as the nation of Israel demonstrated with its history in the Bible.

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