It was narrated from Ibn Tawus that his father said:
"I heard Ibn 'Abbas saying: 'We used to memorize Ahadith, and Ahadith were memorized from the Messenger of Allah ﷺ. But if you go to the extremes of either exaggeration or negligence (in narrating Ahadith), there is no way we can trust your Ahadith.'"

حَدَّثَنَا الْعَبَّاسُ بْنُ عَبْدِ الْعَظِيمِ الْعَنْبَرِيُّ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَنْبَأَنَا مَعْمَرٌ، عَنِ ابْنِ طَاوُسٍ، عَنْ أَبِيهِ، قَالَ سَمِعْتُ ابْنَ عَبَّاسٍ، يَقُولُ إِنَّمَا كُنَّا نَحْفَظُ الْحَدِيثَ وَالْحَدِيثُ يُحْفَظُ عَنْ رَسُولِ اللَّهِ ﷺ فَأَمَّا إِذَا رَكِبْتُمُ الصَّعْبَ وَالذَّلُولَ فَهَيْهَاتَ .