It is narrated from the Mother of the Believers, Sayyidah Umm Salamah (may Allah be pleased with her), that the Messenger of Allah (peace and blessings be upon him) stood up and said: "O people!" She relates: I heard this while my hair was being combed, so I told the woman combing my hair, and she gathered up my hair. Then I went forward until I reached the nearest edge of the chamber. Then the Messenger of Allah (peace and blessings be upon him) said: "O people! I will go ahead of you to the Pool, and you will be brought in group after group, then you will be driven away from me. I will say: 'Where are these people going?' It will be said: 'They changed (the religion) after you.' So I will say: 'Away with them, away with them!'"
Hadith Referenceالمعجم الأوسط / باب الميم / 8714
Hadith Takhrij«أخرجه مسلم فى «صحيحه» برقم: 2295، والنسائي فى «السنن الكبرى» برقم: 11396، وأحمد فى «مسنده» برقم: 27189، وابن أبي شيبة فى «مصنفه» برقم: 32318، 38334، والطبراني فى «الكبير» برقم: 661، 662، 997، 996»