'Alqama said, "A man came to 'Abdullah and said, 'Should I ask
permission to go in where my mother is?' He said, 'At all times. Do you
want to see her (exposed)?'"
Ibn 'Umar reported that when his children had reached puberty
and he had withdrawn to his room, none of them entered where he was except
with his permission.
Muslim ibn Nadhir said, "A man asked Hudhayfa, 'Should I ask permission
to enter where my mother is?' He replied, 'If you were not to ask her permission,
you would see what you dislike.'"