Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
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السيوطي:٢٣٠٦٥a

"مَنْ كذبَ علَيَّ مُتعَمِّدًا فليَتبَوَّأ بَيتًا في النارِ، وَمَنْ رَدَ حَديثًا بَلغهُ عنِّي، فأنا مُخاصِمُهُ يَوْمَ القِيَامَةِ، وَإِذا بَلغكُم عنِّي حَدِيث فلمْ (يَعْرِفُوهُ) (*) فقُولُوا: الله أَعْلم".  

[طب] الطبرانى في الكبير عن سلمان

See similar narrations below:

Collected by Ṭabarānī
tabarani:6163Bakr b. Muḥammad al-Qazzāz al-Baṣrī > Isḥāq b. Ibrāhīm b. Ghālib al-Sulamī > Muḥammad b. ʿAbd al-Raḥman b. ʿAbdullāh Abū Bakr al-ʿAbdī > Isḥāq b. Yūnus b. Saʿd > Hilāl al-Wazzān > Saʿīd b. al-Musayyib > Salmān

[Machine] The Messenger of Allah ﷺ said: "Whoever deliberately lies about me, let him prepare a place for himself in the Fire. And whoever attributes a statement to me that I did not say, let him prepare a place for himself in the Fire. And whoever narrates a statement from me, knowing that it is false, then I am his opponent on the Day of Resurrection. And when a narration reaches you from me and you did not know it, then say: 'Allah knows best.'"  

الطبراني:٦١٦٣حَدَّثَنَا بَكْرُ بْنُ مُحَمَّدٍ الْقَزَّازُ الْبَصْرِيُّ ثنا إِسْحَاقُ بْنُ إِبْرَاهِيمَ بْنِ غَالِبٍ السُّلَمِيُّ حَدَّثَنِي مُحَمَّدُ بْنُ عَبْدِ الرَّحْمَنِ بْنِ عَبْدِ اللهِ أَبُو بَكْرٍ الْعَبْدِيُّ عَنْ إِسْحَاقَ بْنِ يُونُسَ بْنِ سَعْدٍ عَنْ هِلَالٍ الْوَزَّانِ عَنْ سَعِيدِ بْنِ الْمُسَيِّبِ عَنْ سَلْمَانَ ؓ قَالَ

قَالَ رَسُولُ اللهِ ﷺ مَنْ كَذَبَ عَلَيَّ مُتَعَمِّدًا فَلْيَتَبَوَّأْ بَيْتًا فِي النَّارِ وَمَنْ رَدَّ حَدِيثًا بَلَغَهُ عَنِّي فَلْيَتَبَوَّأْ بَيْتًا فِي النَّارِ وَمَنْ رَدَّ حَدِيثًا بَلَغَهُ عَنِّي فَأَنَا مُخاصِمُهُ يَوْمَ الْقِيَامَةِ وَإِذَا بَلَغَكُمْ عَنِّي حَدِيثٌ وَلَمْ تَعْرِفُوهُ فَقُولُوا اللهُ أَعْلَمُ