Sahih Muslim - صحيح مسلم
3) Chapter: The Prohibition of Narrating Everything One Hears
Muhammad bin ul-Muthannā narrated to us, he said I heard Abd ar-Rahman bin Mahdī saying:
‘A man cannot be an Imām whose example is followed until he withholds from some of what he hears’.
Reference: Introduction 12In-book reference: Introduction, Narration 11Grade: Sahih
3) باب النَّهْىِ عَنِ الْحَدِيثِ، بِكُلِّ مَا سَمِعَ
وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ سَمِعْتُ عَبْدَ الرَّحْمَنِ بْنَ مَهْدِيٍّ، يَقُولُ لاَ يَكُونُ الرَّجُلُ إِمَامًا يُقْتَدَى بِهِ حَتَّى يُمْسِكَ عَنْ بَعْضِ مَا سَمِعَ .