Stand down! I’ve heard that said many times over the years in person, on TV and the radio. It’s always said in a command voice and means to urgently stop doing whatever you are doing and step back from the situation or person. It nearly always is meant to prevent harm or death, especially in a military of police setting.
Many years ago I preached a sermon titled ‘The King of Second Chances’. It was based on King David’s fall from grace and subsequent repentance and forgiveness. The scripture I used was Psalm 51:7-17 where David sought the Lords forgiveness for his sins and asked Him to restore his joy.