Musnad Ahmad 27:1538

Harun ibn Ma'ruf narrated to us, Abdullah ibn Wahb narrated to us, he said: Haywah said, Abu Uthman informed me that Abdullah ibn Dinar informed him, from Abdullah ibn Umar, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The most forged of forgeries is for a man to claim lineage to other than his father, or for a man to show his eyes in a dream what they did not see, or for a man to alter the boundaries of the land."