Nathan admonished David: Why did you despise the word of the LORD by doing what is evil in his eyes? 2 Samuel 12:9

King David had fallen in love with a very beautiful woman named Bathsheba, but she was married with Uriah, an officer of the army of David. It was so that David sent Uriah on a very dangerous military mission so that he would die, and thus be able to take Bathsheba as his wife. And so it happened, Uriah died in combat and David took Bathsheba as his wife.
What David had done displeased the Lord and it was then that God sent the prophet Nathan with a message, a parable with which he admonished David, and so the Bible relates the fact:
"The LORD sent Nathan to David. When he came to him, he said, ´There were two men in a certain town, one rich and the one poor. The rich man had a very large number of sheep and cattle, but the poor man had nothing except one little ewe lamb he had bought. He raised it, and it grew up with him and his children. It shared his food, drank from his cup and even slept in his arms. It was like a daughter to him.
Now a traveler came to the rich man, but the rich man refrained from taking one of his own sheep or cattle to prepare a meal for the traveler who had come to him. Instead, he took the ewe lamb that belonged to the poor man and prepared it for the one who had come to him" 2 Samuel 12:1-4.
The parable that Nathan told him produced a great rejection of David, impiety is a serious sin before the Lord, for which Nathan replied:
"Then Nathan said to David, ´You are the man! This is what the LORD, the God of Israel, says: ´I anointed you king over Israel, and I delivered you from the hand of Saul. I gave your master's house to you, and your master's wives into your arms. I gave you all Israel and Judah. And if all this had been too little, I would have given you even more. Why did you despise the word of the LORD by doing what is evil in his eyes?´" 2 Samuel 12:7-9.
What this story teaches us is that we are all sinners before God, no one is exempt from sin, but in David sin was the exception, and in this particular case the sin of lust. God demands of us the righteous life: "You must be blameless before the LORD" Deuteronomy 18:13.

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