Sunan At-Tirmidhi

Narrated Abu Hurairah:""Some people among the Companions of the Messenger of Allah (ﷺ) said: 'O Messenger of Allah! Who are these people whom Allah mentioned, that if we turn away they would replace us, then they would not be like us?'"" He said: ""And Salman was beside the Messenger of Allah (ﷺ), so the Messenger of Allah (ﷺ) patted Salman's thigh and said: 'This one and his companions, and by the One in Whose Hand is my soul! If faith were suspended from Pleiades, then it would be reached by men from Persia