It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Refrain from attributing any statement to me except that of which you are certain, for whoever attributes a false statement to me should prepare his abode in the Hellfire."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2675
Hadith Gradingحکم دارالسلام:صحيح لغيره، دون قوله : اتقوا الحديث عني إلا ما علمتم وهذا إسناد ضعيف، لضعف عبدالأعلى الثعلبي