2 Samuel 13:5

Jonadab said, Make thyself sick He advises Amnon to pretend that his stomach was so weak that he could eat nothing that his servants dressed, and therefore desired his sister, who understood how to make delicate dishes, might come and prepare something that he could relish. Ah! false, treacherous, and base flatterer! that could thus tempt thy prince to so vile a crime! More than the poison of asps is under the lips of such friends and counsellors.