Kharjh bin Mus'ab bin Kharjh خارجة بن مصعب بن خارجة · The Book of the Sunnah

"When the Messenger of Allah (ﷺ) sent me to Yemen, he said: 'Do not pass any judgment or make any decision except on the basis of what you know. If you are uncertain about a matter, wait until you understand it fully, or write to me concerning it.'" (Maudu')