Hadithcore
Al-Adab Al-Mufrad, 884
sahih· Mauquf

'Umar said, "A man is reckoned to be lying when he gives voice to all that he hears." He said, "As for cases of indirect allusion, are they enough to keep a Muslim from lying?"

حَدَّثَنَا الْحَسَنُ بْنُ عُمَرَ، قَالَ‏:‏ حَدَّثَنَا مُعْتَمِرٌ قَالَ أَبِي‏:‏ حَدَّثَنَا ابْنُ عُمَرَ، عَنْ عُمَرَ، فِيمَا أَرَى شَكَّ أَبِي، أَنَّهُ قَالَ‏:‏ حَسْبُ امْرِئٍ مِنَ الْكَذِبِ أَنْ يُحَدِّثَ بِكُلِّ مَا سَمِعَ‏.‏

References2 variants
In-Book Reference
Book 37, Hadith 10
English Reference
Book 37, Hadith 884