that the Messenger of Allah (ﷺ) said: "Whenever there are three of you, then let two not converse in exclusion of their companion."
Jami` at-Tirmidhi Book 43, Hadith 99
← Previous Hadith from their father that the Messenger of Allah (ﷺ) said: "An omen is in three: A woman, a dwelling, and a (riding) beast."

Jami` at-Tirmidhi Book 43, Hadith 98 Next Hadith → that Abu Juhaifah said: "I saw the Messenger of Allah (ﷺ) (he was) white and turning grey. Al-Hasan bin 'Ali resembles him most. He had promised thirteen young she-camels for us, so we went to get them. When we arrived he had died without giving us anything. So when Abu Bakr (became the Khalifah) he said: 'If there is anyone to whom the Messenger of Allah (ﷺ) made a promise, then let him come forth.' I stood to inform him about it, and he ordered that they be given to us."

Jami` at-Tirmidhi Book 43, Hadith 100