Musannaf Ibn Abi Shayba 13:2716

Abu Bakr narrated to us, he said: Abu Usamah narrated to us, from al-A’mash, he said: Ibrahim al-Taymi, Ibrahim al-Nakha’i, Khaythamah, and our companions used to come to us at the market shops. They would not add anything beyond saying, "Peace be upon you" (al-salamu ‘alaykum), and then they would enter.