Gifts of Knowledge

Ibn al-Qayyim said, “ʿUqbah ibn Muslim said, ‘I was with Ibn ʿUmar  for thirty-four months, when asked a question he would very often say, ‘I don’t know.’’ And Saʿīd ibn al-Musayyib would hardly give a fatwā or say something without adding, ‘O Allah, save me, and save them from me.’”
Iʿlāmul-Muwaqqiʿīn, 6/134.