Musannaf Ibn Abi Shayba 27:619

Yazid narrated to us, from Humayd al-Tawil, from Anas ibn Malik, that the Messenger of Allah (may Allah bless him and grant him peace) said: "There will come to you a people who are more tender-hearted." He said: Then the Ash'ariyyun arrived, and among them was Abu Musa. He said: They began to chant: "Tomorrow we shall meet the beloved, Muhammad and his party."