Historical clue formulations

• "Quit your bickering!" — 2021-01-23
• "No fighting!" — 2019-10-20
• "Quit your squabbling" — 2014-07-18
• "Don't fight" — 2009-11-29
• "Please refrain from personal attacks" — 2007-05-24
• "Don't fight" — 2007-04-08
• "No nasty comments!" — 2006-09-27
• Parental plea — 2002-12-14
• Admonition to a child — 1999-12-16