Musannaf Ibn Abi Shaybah 5507 — People who pray in congregation

Musa bin Muslim said: I was with Ibrahim al-Taymi, Ibrahim al-Nakha'i, Zirr and Salamah bin Kuhayl on a Friday. Zirr and al-Taymi mentioned the Friday, and then they prayed the Friday prayer as four rak'ahs in that very place; they were in hiding out of fear (of the tyrant al-Hajjaj bin Yusuf).