You have been there and seen it with your own eyes [...] If I was going at 100mph, and saw the speedometer saying 100mph, it would be a bit odd, wouldn't it, if I said somebody assured me that I wasn't? Because it's what you've seen with your own eyes.
Notes from Wikiquote
As chair of Privileges Committee of the House of Commons to Boris Johnson on 21 March. The committee was investigating allegations the former prime minister had misled the Commons over the gathering at 10 Downing Street collectively known as Partygate.