Nathan is a true prophet. He was famous for his faithful and courageous confronting king David on matters concerning David’s sin against God. Nathan’s message was unpleasant and David was the most powerful man in the kingdom. David’s murder of Uriah the husband of Bathsheba, the woman with whom David had committed adultry was cruel and without second thought even though Uriah was one of his elite mighty men who had faithfully served him and helped him to secure the throne. Nathan could have been killed instantly by David. Yet Nathan feared God and not man.
David immediately knew and acknowledged that God had indeed sent Nathan, and repented.
2 Samuel 12:1-12 New King James Version (NKJV)
1 Then the Lord sent Nathan to David. And he came to him, and said to him: “There were two men in one city, one rich and the other poor.2 The rich man had exceedingly many flocks and herds. 3 But the poor man had nothing, except one little ewe lamb which he had bought and nourished; and it grew up together with him and with his children. It ate of his own food and drank from his own cup and lay in his bosom; and it was like a daughter to him. 4 And a traveler came to the rich man, who refused to take from his own flock and from his own herd to prepare one for the wayfaring man who had come to him; but he took the poor man’s lamb and prepared it for the man who had come to him.”5 So David’s anger was greatly aroused against the man, and he said to Nathan, “As the Lordlives, the man who has done this shall surely die! 6 And he shall restore fourfold for the lamb, because he did this thing and because he had no pity.”7 Then Nathan said to David, “You are the man! Thus says theLord God of Israel: ‘I anointed you king over Israel, and I delivered you from the hand of Saul. 8 I gave you your master’s house and your master’s wives into your keeping, and gave you the house of Israel and Judah. And ifthat had been too little, I also would have given you much more! 9 Why have you despised the commandment of theLord, to do evil in His sight? You have killed Uriah the Hittite with the sword; you have taken his wife to be your wife, and have killed him with the sword of the people of Ammon. 10 Now therefore, the sword shall never depart from your house, because you have despised Me, and have taken the wife of Uriah the Hittite to be your wife.’ 11 Thus says the Lord: ‘Behold, I will raise up adversity against you from your own house; and I will take your wives before your eyes and give them to your neighbor, and he shall lie with your wives in the sight of this sun. 12 For you did it secretly, but I will do this thing before all Israel, before the sun.’”