Musannaf Ibn Abi Shayba 3:3114

Abu Bakr narrated to us, he said: Muhammad ibn Ubayd narrated to us, from al-Zibriqan, who said: I said to Shaqiq, "Indeed, al-Hajjaj delays the Friday [prayer]." He said, "Keep it secret." He said: I said, "Yes." He said, "Pray it in your house at its [proper] time, and do not abandon the congregation."