Musannaf Ibn Abi Shayba 13:697

Abu Bakr narrated to us, he said: Abu Dawud al-Tayalisi narrated to us, from Hammad ibn Salamah, from Qatadah, from al-Hasan and Sa’id ibn al-Musayyib, they both said: "There is no testimony for him, and his repentance is between him and Allah."