The Prophet ﷺ said, "The most sinful person among the Muslims is the one who asked about something which had not been prohibited, but was prohibited because of his asking."  

أَنَّ النَّبِيَّ ﷺ قَالَ إِنَّ أَعْظَمَ الْمُسْلِمِينَ جُرْمًا مَنْ سَأَلَ عَنْ شَىْءٍ لَمْ يُحَرَّمْ فَحُرِّمَ مِنْ أَجْلِ مَسْأَلَتِهِ  

The Prophet ﷺ said, "If you knew that which I know, you would laugh little and weep much."  

قَالَ النَّبِيُّ ﷺ لَوْ تَعْلَمُونَ مَا أَعْلَمُ لَضَحِكْتُمْ قَلِيلاً وَلَبَكَيْتُمْ كَثِيرًا  

Once the people started asking Messenger of Allah ﷺ questions, and they asked so many questions that he became angry and ascended the pulpit and said, "I will answer whatever questions you may ask me today." I looked right and left and saw everyone covering his face with his garment and weeping. Behold ! There was a man who, on quarreling with the people, used to be called as a son of a person other than h is father. He said, "O Messenger of Allah ﷺ! Who is my father?" The Prophet ﷺ replied, "Your father is Hudhaifa." And then ʿUmar got up and said, "We accept Allah as our Lord, and Islam as (our) religion, and Muhammad as (our) Apostle; and we seek refuge with Allah from the afflictions." Messenger of Allah ﷺ said, " I have never seen a day like today in its good and its evil for Paradise and the Hell Fire were displayed in front of me, till I saw them just beyond this wall." Qatada, when relating this Hadith, used to mention the following Verse:-- 'O you who believe! Ask not questions about things which, If made plain to you, May cause you trouble. (5.101)  

عَنْ أَنَسٍ ؓ سَأَلُوا رَسُولَ اللَّهِ ﷺ حَتَّى أَحْفَوْهُ الْمَسْأَلَةَ فَغَضِبَ فَصَعِدَ الْمِنْبَرَ فَقَالَ لاَ تَسْأَلُونِي الْيَوْمَ عَنْ شَىْءٍ إِلاَّ بَيَّنْتُهُ لَكُمْ فَجَعَلْتُ أَنْظُرُ يَمِينًا وَشِمَالاً فَإِذَا كُلُّ رَجُلٍ لاَفٌّ رَأْسَهُ فِي ثَوْبِهِ يَبْكِي فَإِذَا رَجُلٌ كَانَ إِذَا لاَحَى الرِّجَالَ يُدْعَى لِغَيْرِ أَبِيهِ فَقَالَ يَا رَسُولَ اللَّهِ مَنْ أَبِي قَالَ حُذَافَةُ ثُمَّ أَنْشَأَ عُمَرُ فَقَالَ رَضِينَا بِاللَّهِ رَبًّا وَبِالإِسْلاَمِ دِينًا وَبِمُحَمَّدٍ ﷺ رَسُولاً نَعُوذُ بِاللَّهِ مِنَ الْفِتَنِ فَقَالَ رَسُولُ اللَّهِ ﷺ مَا رَأَيْتُ فِي الْخَيْرِ وَالشَّرِّ كَالْيَوْمِ قَطُّ إِنَّهُ صُوِّرَتْ لِي الْجَنَّةُ وَالنَّارُ حَتَّى رَأَيْتُهُمَا وَرَاءَ الْحَائِطِ وَكَانَ قَتَادَةُ يَذْكُرُ عِنْدَ الْحَدِيثِ هَذِهِ الآيَةَ {يَا أَيُّهَا الَّذِينَ آمَنُوا لاَ تَسْأَلُوا عَنْ أَشْيَاءَ إِنْ تُبْدَ لَكُمْ تَسُؤْكُمْ}  

The Prophet ﷺ was asked about things which he did not like, but when the questioners insisted, the Prophet got angry. He then said to the people, "Ask me anything you like." A man asked, "Who is my father?" The Prophet ﷺ replied, "Your father is Hudhafa." Then another man got up and said, "Who is my father, O Messenger of Allah ﷺ ?" He replied, "Your father is Salim, Maula (the freed slave) of Shaiba." So when ʿUmar saw that (the anger) on the face of the Prophet ﷺ he said, "O Messenger of Allah ﷺ! We repent to Allah (Our offending you).  

سُئِلَ النَّبِيُّ ﷺ عَنْ أَشْيَاءَ كَرِهَهَا فَلَمَّا أُكْثِرَ عَلَيْهِ غَضِبَ ثُمَّ قَالَ لِلنَّاسِ سَلُونِي عَمَّا شِئْتُمْ قَالَ رَجُلٌ مَنْ أَبِي قَالَ أَبُوكَ حُذَافَةُ فَقَامَ آخَرُ فَقَالَ مَنْ أَبِي يَا رَسُولَ اللَّهِ فَقَالَ أَبُوكَ سَالِمٌ مَوْلَى شَيْبَةَ فَلَمَّا رَأَى عُمَرُ مَا فِي وَجْهِهِ قَالَ يَا رَسُولَ اللَّهِ إِنَّا نَتُوبُ إِلَى اللَّهِ ﷻ