Sahih Bukhari Volume 4, Book 56, Hadith 3057

قَالَ ابْنُ عُمَرَ انْطَلَقَ النَّبِيُّ صلى الله عليه وسلم وَأُبَىُّ بْنُ كَعْبٍ يَأْتِيَانِ النَّخْلَ الَّذِي فِيهِ ابْنُ صَيَّادٍ، حَتَّى إِذَا دَخَلَ النَّخْلَ طَفِقَ النَّبِيُّ صلى الله عليه وسلم يَتَّقِي بِجُذُوعِ النَّخْلِ وَهْوَ يَخْتِلُ ابْنَ صَيَّادٍ أَنْ يَسْمَعَ مِنِ ابْنِ صَيَّادٍ شَيْئًا قَبْلَ أَنْ يَرَاهُ، وَابْنُ صَيَّادٍ مُضْطَجِعٌ عَلَى فِرَاشِهِ فِي قَطِيفَةٍ لَهُ فِيهَا رَمْزَةٌ، فَرَأَتْ أُمُّ ابْنِ صَيَّادٍ النَّبِيَّ صلى الله عليه وسلم وَهْوَ يَتَّقِي بِجُذُوعِ النَّخْلِ، فَقَالَتْ لاِبْنِ صَيَّادٍ أَىْ صَافِ ـ وَهْوَ اسْمُهُ ـ فَثَارَ ابْنُ صَيَّادٍ، فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ لَوْ تَرَكَتْهُ بَيَّنَ ‏"‏‏

Narrated By Ibn Umar : (Later on) Allah's Apostle (once again) went along with Ubai bin Ka'b to the garden of date-palms where Ibn Saiyad was staying. When the Prophet entered the garden, he started hiding himself behind the trunks of the date-palms as he wanted to hear something from the Ibn Saiyad before the latter could see him. Ibn Saiyad was lying in his bed, covered with a velvet sheet from where his murmurs were heard. Ibn Saiyad's mother saw the Prophet while he was hiding himself behind the trunks of the date-palms. She addressed Ibn Saiyad, "O Saf!" (And this was his name). Ibn Saiyad got up. The Prophet said, "Had this woman let him to himself, he would have revealed the reality of his case."