Hadith 57:8
Yahyā bin Yahyā narrated to us, Hushaym informed us, on authority of Sulaymān at-Taymī, on authority of Abī Uthmān an-Nahdī, he said, Umar bin ul-Khattāb, may Allah be pleased with him, said:
‘It is enough of a lie for a man that he narrates everything he hears’.
وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا هُشَيْمٌ، عَنْ سُلَيْمَانَ التَّيْمِيِّ، عَنْ أَبِي عُثْمَانَ النَّهْدِيِّ، قَالَ قَالَ عُمَرُ بْنُ الْخَطَّابِ رضى الله تعالى عنه بِحَسْبِ الْمَرْءِ مِنَ الْكَذِبِ أَنْ يُحَدِّثَ بِكُلِّ مَا سَمِعَ
Original Reference: Sahih Muslim Introduction 9