It is narrated from Hazrat Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Whoever deliberately attributes a false statement to me, he should make his abode in Hell. He said this twice.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 13961
Hadith Gradingحکم دارالسلام:حديث صحيح متواتر، خ: 108، م فى المقدمة: 2