Sa'id al-Maqburi said, "I passed by Ibn 'Umar who had a man with
him with whom he was conversing. I went to them, and he struck me on the
chest and said, 'When you find two men conversing, do not go up to them
nor sit with them until they give you permission.' I said. 'May Allah make
you prosper, Abu 'Abdu'r-Rahman. I hoped that I would hear something good
from you.'"