Imaam Maalik was asked about the Raafidah, so he said, “Do not speak to them, nor relate from them, for indeed they lie.” [Minhaaj As-Sunnah, 1/13]
Shareek Ibn ‘Abdillaah Al-Qaadee, known to have leanings towards exaggerating regarding the Prophet (saw)’s family, though he was just said, “Take from all whom you meet, except for the Raafidah, for they fabricate hadeeths and then take it to be their Religion.” [Minhaaj As-Sunnah]
Hammaad Ibn Salamah said, “One of the shaykhs of the Raafidah said, ‘When we used to gather and find something to be good, we would make it a hadeeth.’ ” [Minhaaj As-Sunnah]
Imaam Ash-Shaafi’ee said, “Among the people who follow their own desires, I have not seen a group bear witness to more lies than the Raafidah.” [Ikhtisaar Uloom Al-Hadeeth, by Ibn Katheer, p.109]
Not only were the Shee’ah the worst of liars, they were also the first to fabricate ahaadeeth:
Ibn Abee Al-Hadeed said, “Know that lies in the hadeeth of virtues first started with the Shee’ah…” [Sharh Nahjul Balaaghah, 2/134]
^This is with the knowledge that Ibn Abee Al-Hadeed was himself a Shee’ah and a Mu’tazilee.
[Taken from “The Sunnah And Its Role In Islamic Legislation” by Shaykh Mustafa As-Sibaa’ee, P.114]
http://ummahboard.com/showthread.php?2143-Deviation-(Shia)-Rafidah-Are-The-Worst-Of-Liars