Sunan An-Nasa'i

It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) went out to the graveyeard and said:""Peace be upon you, abode of believing people. If Allah wills, we shall join you soon. Would that I had seen our brothers."" They said: ""O Messenger of Allah, are we not your brother?"" He said: ""You are my Companions. My brothers are those who have not come yet. And I will reach the Hawd before you."" They said: ""O Messenger of Allah, how will you know those of your Ummah who come after you?"" He said: ""Don't you think that if a man has a horse with a white blaze and white feet among horses that are solid black, he will recognize his horse?"" They said: ""Of course."" He said: ""They will come on the Day of Resurrection with glittering white faces and glittering white hands and feet because of Wudu', and I will reach the Hawd before them