Not graded
Sahih Muslim intro-11
وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ سَمِعْتُ عَبْدَ الرَّحْمَنِ بْنَ مَهْدِيٍّ، يَقُولُ لاَ يَكُونُ الرَّجُلُ إِمَامًا يُقْتَدَى بِهِ حَتَّى يُمْسِكَ عَنْ بَعْضِ مَا سَمِعَ .
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’.
Reported by Muslim (No. intro-11).