Caesar's wife must be above suspicion.
Prov. The associates of public figures must not even be suspected of wrongdoing. (The ancient Roman Julius Caesar is supposed to have said this when asked why he divorced his wife, Pompeia. Because she was suspected of some wrongdoing, he could not associate with her anymore.) Jill: I don't think the mayor is trustworthy; his brother was charged with embezzlement. Jane: But the charges were never proved. Jill: That doesn't matter. Caesar's wife must be above suspicion. When the newspapers reported the rumor that the lieutenant governor had failed to pay his taxes, the governor forced him to resign, saying, "Caesar's wife must be above suspicion."