Abdullah bin Mas'ud narrated:"We were in a tent with the Messenger of Allah (s.a.w), about forty of us when the Messenger of Allah (s.a.w) said to us: 'Would you be pleased to be a quarter of the people of Paradise?' They said:'Yes.' He said: 'Would you be pleased to be a third of the people of Paradise?' They said: 'Yes.' He said: 'Would you be pleased to be one half of the people of Paradise? Verily none shall enter Paradise except a Muslim soul. And you are not with relation to Shirk except like the white hair on the hide of a black bull or like the black hair on the hide of a red bull." Other chains report similar narrations

English translation · Jami' at-Tirmidhi