Sahih Bukhari Volume 2, Book 23, Hadith 1356

وَقَالَ سَالِمٌ سَمِعْتُ ابْنَ عُمَرَ ـ رضى الله عنهما ـ يَقُولُ انْطَلَقَ بَعْدَ ذَلِكَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَأُبَىُّ بْنُ كَعْبٍ إِلَى النَّخْلِ الَّتِي فِيهَا ابْنُ صَيَّادٍ وَهُوَ يَخْتِلُ أَنْ يَسْمَعَ مِنِ ابْنِ صَيَّادٍ شَيْئًا قَبْلَ أَنْ يَرَاهُ ابْنُ صَيَّادٍ فَرَآهُ النَّبِيُّ صلى الله عليه وسلم وَهُوَ مُضْطَجِعٌ، يَعْنِي فِي قَطِيفَةٍ لَهُ فِيهَا رَمْزَةٌ أَوْ زَمْرَةٌ، فَرَأَتْ أُمُّ ابْنِ صَيَّادٍ رَسُولَ اللَّهِ صلى الله عليه وسلم وَهُوَ يَتَّقِي بِجُذُوعِ النَّخْلِ فَقَالَتْ لاِبْنِ صَيَّادٍ يَا صَافِ ـ وَهْوَ اسْمُ ابْنِ صَيَّادٍ ـ هَذَا مُحَمَّدٌ صلى الله عليه وسلم‏.‏ فَثَارَ ابْنُ صَيَّادٍ فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ لَوْ تَرَكَتْهُ بَيَّنَ ‏"‏‏.‏ وَقَالَ شُعَيْبٌ فِي حَدِيثِهِ فَرَفَصَهُ رَمْرَمَةٌ، أَوْ زَمْزَمَةٌ‏.‏ وَقَالَ إِسْحَاقُ الْكَلْبِيُّ وَعُقَيْلٌ رَمْرَمَةٌ‏.‏ وَقَالَ مَعْمَرٌ رَمْزَةٌ‏

(Ibn 'Umar added): Later on Allah's Apostle (p.b.u.h) once again went along with Ubai bin Ka'b to the date-palm trees (garden) where Ibn Saiyad was staying. The Prophet (p.b.u.h) wanted to hear something from Ibn Saiyad before Ibn Saiyad could see him, and the Prophet (p.b.u.h) saw him lying covered with a sheet and from where his murmurs were heard. Ibn Saiyad's mother saw Allah's Apostle while he was hiding himself behind the trunks of the date-palm trees. She addressed Ibn Saiyad, "O Saf ! (and this was the name of Ibn Saiyad) Here is Muhammad." And with that Ibn Saiyad got up. The Prophet said, "Had this woman left him (Had she not disturbed him), then Ibn Saiyad would have revealed the reality of his case.