Nathan was a prophet who served King David and his son and successor King Solomon. He was a wise and steadfast servant of God who is first spoken when David decided to build a temple to house the Ark of the Covenant.
He appears again to reprove David for his sin with Bathsheba.
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 other 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)
When David burned with anger against the man Nathan spoke about, decrying that he must surely die, Nathan fearlessly told the king that he was the man. He once again showed his fearlessness when he intervened during the palace coup attempted by Adonijah. Adonijah was David's son who tried to succeed David as king in place of Solomon, but Nathan revealed the plot to the king and had it stopped.
Nathan was charged with the education of Solomon, playing a prominent part at his accession to the throne. Nathan's two sons occupied places of honor at the King's court. He makes a final appearance in the Bible when he assisted David in reorganizing public worship.