Musnad Ahmad 1156:75

Abu Amir narrated to us, Aflah bin Sa’id narrated to us, he said: Abdullah bin Rafi’ narrated to us, he said: Umm Salamah used to narrate that she heard the Prophet, peace and blessings of Allah be upon him, saying from upon the pulpit while she was combing her hair: "O people." She said to her hair-comber: "Twist my hair." She said: She said: "May I be sacrificed for you, he is only saying: 'O people'." I said: "Woe to you, are we not among the people?" So she twisted her hair, and she stood in her room, and she heard him saying: "O people, while I am at the Basin (al-Hawd), you will be brought in groups, then the paths will separate you. So I will call out to you: 'Come to the path!' Then a caller will call out to me from behind me, and he will say: 'They have indeed changed after you.' So I will say: 'Away with them, away with them.'"