Narrated Sa`d bin Abi Waqqas: 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."
The chain is ordered from the source of the saying to the compiler: 1 = the speaker/first transmitter, the following links those who passed it on in turn, and at the bottom al-Bukhari who compiled the work. Click a narrator to list every hadith in which he appears; the number in parentheses is how many hadiths across the collections on this site the narrator appears in.