It is narrated from Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Among the greatest of lies is that someone attributes to me what I did not say, or that someone makes his eyes see in a dream what they did not see, or that he ascribes himself to someone other than his father."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18391