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 ﷺ said, "If she had left him undisturbed, he would have revealed his reality." (See Hadith No. 290, Vol 4 for details)

حَدَّثَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ سَالِمٌ سَمِعْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ ـ رضى الله عنهما ـ يَقُولُ انْطَلَقَ رَسُولُ اللَّهِ ﷺ وَأُبَىُّ بْنُ كَعْبٍ الأَنْصَارِيُّ يَؤُمَّانِ النَّخْلَ الَّتِي فِيهَا ابْنُ صَيَّادٍ حَتَّى إِذَا دَخَلَ رَسُولُ اللَّهِ ﷺ طَفِقَ رَسُولُ اللَّهِ ﷺ يَتَّقِي بِجُذُوعِ النَّخْلِ، وَهْوَ يَخْتِلُ أَنْ يَسْمَعَ مِنِ ابْنِ صَيَّادٍ شَيْئًا قَبْلَ أَنْ يَرَاهُ، وَابْنُ صَيَّادٍ مُضْطَجِعٌ عَلَى فِرَاشِهِ فِي قَطِيفَةٍ لَهُ فِيهَا رَمْرَمَةٌ ـ أَوْ زَمْزَمَةٌ ـ فَرَأَتْ أُمُّ ابْنِ صَيَّادٍ النَّبِيَّ ﷺ وَهْوَ يَتَّقِي بِجُذُوعِ النَّخْلِ، فَقَالَتْ لاِبْنِ صَيَّادِ أَىْ صَافِ، هَذَا مُحَمَّدٌ. فَتَنَاهَى ابْنُ صَيَّادٍ، قَالَ رَسُولُ اللَّهِ ﷺ
" لَوْ تَرَكَتْهُ بَيَّنَ ".