Sahih al-Bukhari 129
Sahih al-Bukhari · Book 3: Knowledge · Whoever selected some people to teach them (religious) knowledge preferring them over others for fear that the others may not understand it
Narrated Anas:
حَدَّثَنَا مُسَدَّدٌ ، قَالَ حَدَّثَنَا مُعْتَمِرٌ ، قَالَ سَمِعْتُ أَبِي قَالَ، سَمِعْتُ أَنَسًا ، قَالَ ذُكِرَ لِي أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ لِمُعَاذٍ " مَنْ لَقِيَ اللَّهَ لاَ يُشْرِكُ بِهِ شَيْئًا دَخَلَ الْجَنَّةَ ". قَالَ أَلاَ أُبَشِّرُ النَّاسَ قَالَ " لاَ، إِنِّي أَخَافُ أَنْ يَتَّكِلُوا " .
I was informed that the Prophet (ﷺ) had said to Mu`adh, "Whosoever will meet Allah without associating anything in worship with Him will go to Paradise." Mu`adh asked the Prophet, "Should I not inform the people of this good news?" The Prophet (ﷺ) replied, "No, I am afraid, lest they should depend upon it (absolutely).