Musannaf Ibn Abi Shayba 33:46

Abu Usama narrated to us, from al-A'mash, from Malik ibn al-Harith, from Ibn Abbas, who said: Sulayman ibn Dawud, the Prophet, may Allah bless him and grant him peace, was not spoken to, out of reverence for him. He said: So the afternoon prayer (Asr) passed him by, and no one was able to speak to him.