Musnad Ahmad 26:146

Waki' narrated to us, from Sufyan, from 'Ammar bin Mu'awiyah al-Duhni, from Salim bin Abi al-Ja'd al-Ashja'i, from 'Abdullah bin Mas'ud, who said: The Messenger of Allah (ﷺ) said: "The son of Sumayyah was never presented with two matters, except that he chose the more guided of the two."