Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah ﷺ went to the (Baqi') cemetery and said, "May you be secured from punishment, O dwellers of abode of the believers! We, if Allah wills, will follow you. I wish we see my brothers". The Companions said, "O Messenger of Allah! Are not we your brothers?" He ﷺ said, "You are my Companions, but my brothers are those who have not come into the world yet". They said; "O Messenger of Allah! How will you recognize those of your Ummah who are not born yet?" He ﷺ said, "Say, if a man has white-footed horses with white foreheads among horses which are pure black, will he not recognize his own horses?" They said; "Certainly, O Messenger of Allah!" He ﷺ said, "They (my followers) will come with bright faces and white limbs because of Wudu'; and I will arrive at the Haud (Al-Kauthar) ahead of them". Muslim.