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: "Indeed, the greatest of lies is that a man lies about his own eyes, saying: I saw (a dream), when he did not see it; or that he lies about his parents; or that he says: So-and-so heard me, when he did not hear him." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.