Hadith: There will be in the latter time of my Ummah people who will narrate what neither you nor your fathers have heard. Beware of them

عَنْ ‌أَبِي هُرَيْرَةَ عَنْ رَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ أَنَّهُ قَالَ:
«سَيَكُونُ فِي آخِرِ أُمَّتِي أُنَاسٌ يُحَدِّثُونَكُمْ مَا لَمْ تَسْمَعُوا أَنْتُمْ وَلَا آبَاؤُكُمْ، فَإِيَّاكُمْ وَإِيَّاهُمْ».
[صحيح] - [رواه مسلم] - [صحيح مسلم: 6]

Abu Hurayrah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said:
"There will be in the latter time of my Ummah people who will narrate what neither you nor your fathers have heard. Beware of them."
Sahih/Authentic. - [Muslim]

Explanation

The Prophet (may Allah's peace and blessings be upon him) informed that people would appear in the latter time of his Ummah who would fabricate lies and say things not said by anyone before them, and they would narrate false and fabricated Hadīths. So, he (may Allah's peace and blessings be upon him) commanded us to keep away from them and not to sit with them or listen to their Hadīths, lest the fabricated Hadīths may settle in our souls and we become unable to get rid of them.