Musannaf Ibn Abi Shayba 33:571

Yazid ibn Harun narrated to us, he said: Muhammad ibn ‘Amr informed us, from al-Majishun ibn Abi Salamah, he said: Sa’d ibn Mu’adh said: "There are three things regarding which I am, other than them, weak: I have never heard a statement from the Messenger of Allah (may Allah bless him and grant him peace) except that I knew it was the truth; and I have never performed a prayer and been distracted from it by anything else until I finished it; and I have never followed a funeral and spoken to myself about anything other than what it is saying or what is being said to it until we finished." Muhammad said: I narrated this to al-Zuhri, and he said: "May Allah have mercy on Sa’d; he was indeed trustworthy. I did not think that anyone could be like this except a prophet."