The rich man had very many flocks and herds,
It seems to have been a great while after David had been guilty of adultery with Bath-sheba before he was brought to repentance for it. For, when Nathan was sent to him, the child was born (Sa2 12:14), so that it was about nine months that David lay under the guilt of that sin, and, for aught that appears, unrepented of.
Commenting on 2 Samuel 12:1-14
The rich man had exceeding many flocks and herds. In which the wealth of men lay in those times and countries; these in the parable signify David's wives and concubines, which were many; he had six wives in Hebron, and he took more wives and concubines out of Jerusalem, when he was come from Hebron, Sa2 3:2; and besides his master's, or Saul's wives, given to him, Sa2 12:8. .
2Sa 12:1-4 Nathan’s Reproof. - 2Sa 12:1. To ensure the success of his mission, viz., to charge the king with his crimes, Nathan resorted to a parable by which he led on the king to pronounce sentence of death upon himself. The parable is a very simple one, and drawn from life.
Commenting on 2 Samuel 12:1-4