Ibn 'Umar said, "The Messenger of Allah, may Allah bless him and
grant him peace, said, 'Tell me which tree is like the Muslim? It gives
fruits at all times by the permission of its Lord and its leaves do not
fall.' It occurred to me that it was the palm tree, but I did not want
to speak as Abu Bakr and 'Umar, may Allah be pleased with them, were both
present. When they did not speak, the Prophet, may Allah bless him and
grant him peace, said, 'It is the palm tree.' When I left with my father,
I said, 'Father, I thought that it was the palm,.' He asked, 'What kept
you from saying that? If you had said so, I would have preferred that to
such-and-such.' I said, 'What kept me from doing so was that I did not
see you or Abu Bakr speak, so I did not like to speak out.'"