Musannaf Ibn Abi Shayba 33:530

'Affan narrated to us, he said: Ja'far ibn Sulayman narrated to us, he said: Thabit narrated to us, from Anas, who said: We did not shake the dust from our hands after [burying] the Messenger of Allah, may Allah bless him and grant him peace, until we felt that our hearts had changed.