صحيح البخاري Sahih Bukhari كتاب العلم The Book of Knowledge
بَابُ الْحَيَاءِ فِي الْعِلْمِ:

(50) Chapter. (What is said as regards): To be shy (Al-Haya) while learning (religious) knowledge.

2 hadith
Hadith 130
حَدَّثَنَا مُحَمَّدُ بْنُ سَلَامٍ ، قَالَ : أَخْبَرَنَا أَبُو مُعَاوِيَةَ ، قَالَ : حَدَّثَنَا هِشَامُ ، عَنْ أَبِيهِ ، عَنْ زَيْنَبَ ابْنَةِ أُمِّ سَلَمَةَ ، عَنْ أُمِّ سَلَمَةَ ، قَالَتْ : جَاءَتْ أُمُّ سُلَيْمٍ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، فَقَالَتْ : يَا رَسُولَ اللَّهِ ، " إِنَّ اللَّهَ لَا يَسْتَحْيِي مِنَ الْحَقِّ ، فَهَلْ عَلَى الْمَرْأَةِ مِنْ غُسْلٍ إِذَا احْتَلَمَتْ ؟ قَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : إِذَا رَأَتِ الْمَاءَ ، فَغَطَّتْ أُمُّ سَلَمَةَ تَعْنِي وَجْهَهَا ، وَقَالَتْ : يَا رَسُولَ اللَّهِ ، أَوَتَحْتَلِمُ الْمَرْأَةُ ؟ قَالَ : نَعَمْ ، تَرِبَتْ يَمِينُكِ فَبِمَ يُشْبِهُهَا وَلَدُهَا " .
Narrated Um Salama: Um-Sulaim came to Allah's Apostle and said, "Verily, Allah is not shy of (telling you) the truth. Is it necessary for a woman to take a bath after she has a wet dream (nocturnal sexual discharge?) The Prophet replied, "Yes, if she notices a discharge." Um Salama, then covered her face and asked, "O Allah's Apostle! Does a woman get a discharge?" He replied, "Yes, let your right hand be in dust (An Arabic expression you say to a person when you contradict his statement meaning "you will not achieve goodness"), and that is why the son resembles his mother."
Hadith Reference Sahih Bukhari / The Book of Knowledge / Hadith: 130
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة
Hadith 131
حَدَّثَنَا إِسْمَاعِيلُ ، قَالَ : حَدَّثَنِي مَالِكٌ ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ، أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، قَالَ : " إِنَّ مِنَ الشَّجَرِ شَجَرَةً لَا يَسْقُطُ وَرَقُهَا وَهِيَ مَثَلُ الْمُسْلِمِ ، حَدِّثُونِي مَا هِيَ ؟ فَوَقَعَ النَّاسُ فِي شَجَرِ الْبَادِيَةِ ، وَوَقَعَ فِي نَفْسِي أَنَّهَا النَّخْلَةُ ، قَالَ عَبْدُ اللَّهِ : فَاسْتَحْيَيْتُ ، فَقَالُوا : يَا رَسُولَ اللَّهِ ، أَخْبِرْنَا بِهَا ، فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : هِيَ النَّخْلَةُ " ، قَالَ عَبْدُ اللَّهِ : فَحَدَّثْتُ أَبِي بِمَا وَقَعَ فِي نَفْسِي ، فَقَالَ : لَأَنْ تَكُونَ قُلْتَهَا أَحَبُّ إِلَيَّ مِنْ أَنْ يَكُونَ لِي كَذَا وَكَذَا .
Narrated `Abdullah bin `Umar: Once Allah's Apostle said, "Amongst the trees there is a tree, the leaves of which do not fall and is like a Muslim, tell me the name of that tree." Everybody started thinking about the trees of the desert areas and I thought of the date-palm tree but felt shy (to answer). The others asked, "O Allah's Apostle! inform us of it." He replied, "it is the date-palm tree." I told my father what had come to my mind and on that he said, "Had you said it I would have preferred it to such and such a thing that I might possess."
Hadith Reference Sahih Bukhari / The Book of Knowledge / Hadith: 131
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة