Musannaf Ibn Abi Shayba 3:1070

Abu Usama narrated to us, he said: Al-A'mash narrated to us, from Malik ibn al-Harith, from Ibn Abbas, who said: Sulayman ibn Dawud, the Prophet—peace be upon them both—would not be spoken to, out of reverence for him. So, the Afternoon (Asr) prayer passed him by, and no one was able to speak to him.