Volume 3, Book 48, Number 806:
Narrated Abdullah bin Umar:
Allah’s Apostle and Ubai bin Kab Al-Ansari went to the garden where Ibn Saiyad used to live.
When Allah’s Apostle entered (the garden), he (i.e. Allah’s Apostle ) started hiding himself behind the
datepalms as he wanted to hear secretly the talk of Ibn Saiyad before the latter saw him. Ibn Saiyad
wrapped with a soft decorated sheet was lying on his bed murmuring. Ibn Saiyad’s mother saw the
Prophet hiding behind the stems of the date-palms. She addressed Ibn Saiyad saying, “O Saf, this is
Muhammad.” Hearing that Ibn Saiyad stopped murmuring (or got cautious), the Prophet said, “If she
had left him undisturbed, he would have revealed his reality.” (See Hadith No. 290, Vol 4 for details)