21:1,2
We now come to the infamous incident of Naboth’s vineyard. In understanding the incident it is important to realise how important property, and keeping it in the family was in Israel and in the Law. Ahab saw the vineyard and wanted it for himself. He thought that with his one wealth he could easily get it from Ahab, either by buying it, or by giving Naboth another vineyard in exchange. So he makes his offer to Naboth.
21:3
However, Naboth refused because it belonged to his family, it was “the inheritance of [his] ancestors”, and so not his to give away, but his to look after.