Charles Ellicott Commentary 2 Samuel 12:1

"And Jehovah sent Nathan unto David. And he came unto him, and said unto him, There were two men in one city; the one rich, and the other poor." — 2 Samuel 12:1 (ASV)

Sent Nathan: Nathan was already on intimate terms with David, and recognised by him as a prophet (2 Samuel 7:1–17).