that the Prophet (ﷺ) said: "Whoever learns knowledge for other than (the sake of) Allah, or intends by it other than Allah, then let him take his seat in the Fire."
from his father who said: "Zaid bin Thabit left to go to Marwan during the middle of the day. We said: 'He did not send for him [during] this hour except to ask him about something.' So we got up to ask him, and he said: 'Yes, he asked us about something we heard from the Messenger of Allah (ﷺ). I heard the Messenger of Allah (ﷺ) saying: "May Allah gladden a man who hears a Hadith from us, so he memorizes it until he conveys it to someone else. Perhaps he carries Fiqh to one who is more understanding than him, and perhaps the one who carries the Fiqh is not a Faqih."
"I heard 'Abdur-Rahman bin 'Abdullah bin Mas'ud narrating from his father who said: 'I heard the Messenger of Allah (ﷺ) saying: 'May Allah gladden a man who hears something from us, so he conveys it as he heard it. Perhaps the one it is conveyed to is more understanding than the one who heard it.'"
from 'Abdur-Rahman bin 'Abdullah bin Mas'ud that he narrated from his father, from the Prophet (ﷺ) who said: "May Allah beautify a man who hears a saying of mine, so he understands it, remembers it, and conveys it. Perhaps he carries the Fiqh to one who has more understanding than him. There are three with which the heart of a Muslim shall not be deceived. Sincerity in deeds for Allah, giving Nasihah to the A'immah of Muslims, and sticking to the Jama'ah. For indeed the call is protected from behind them."
from Abu Rafi' and others, from the Prophet (ﷺ) who said: "Let me not find one of you reclining on his couch when a command I ordered, or a prohibition from me comes to him, and he says: 'I do not know. What we find in the Book of Allah, we follow it.'"
" أَلاَ هَلْ عَسَى رَجُلٌ يَبْلُغُهُ الْحَدِيثُ عَنِّي وَهُوَ مُتَّكِئٌ عَلَى أَرِيكَتِهِ فَيَقُولُ بَيْنَنَا وَبَيْنَكُمْ كِتَابُ اللَّهِ فَمَا وَجَدْنَا فِيهِ حَلاَلاً اسْتَحْلَلْنَاهُ وَمَا وَجَدْنَا فِيهِ حَرَامًا حَرَّمْنَاهُ وَإِنَّ مَا حَرَّمَ رَسُولُ اللَّهِ صلى الله عليه وسلم كَمَا حَرَّمَ اللَّهُ "
that the Messenger of Allah (ﷺ) said: "Lo! Soon a Hadith from me will be conveyed to a man, while he is reclining on his couch, and he says: 'Between us and you is Allah's Book. So whatever we find in it that is lawful, we consider lawful, and whatever we find in it that is unlawful, we consider it unlawful.' Indeed whatever the Messenger of Allah (ﷺ) made unlawful, it is the same as what Allah made unlawful."