Shaykh Muhammad Ibn ‘Abdul Wahhāb said, “As for these twelvers, they have left the Sunnah, nay they have left the Millah!” [Risālah Al-Radd ‘Alā Al-Rāfidhah]
Ibn Taymiyyah said, “Whoever claims that some āyāt of the Qur’ān were deleted or hidden… then there is no difference of opinion on making takfīr of him. Also, whoever claims that the Sahābah apostatized after Rasūlullāh except a very few who didn’t exceed a dozen, or that they mostly became fussāq (major sinners), then there is no doubt on making takfīr of him, because he has denied the praises of them that the Qur’ān dictated in several places. Rather, whoever doubts the kufr of such a person, then takfīr of him is obligatory. This is because the meaning of this statement is that the transmitters of the Qur’ān and the Sunnah were kuffār or fussāq. It also means that those indicated by this verse {You are the best nation produced for mankind} [Āl ‘Imrān: 110], whose best generation was the first, were mostly kuffār or fussāq. It also means that this Ummah was the worst of nations and the predecessors of this Ummah were the most evil of its people! The kufr of such a person is known by necessity from the religion of Islam.” [As-Sārim al-Maslūl]
Muhammad Ibn ‘Abdil-Wahhāb said, “The verses of the Qur’ān about the virtues of the Sahābah are numerous and the ahādīth on this are altogether mutawātir explicitly stating their righteousness. Thus whoever believes that the Sahābah or majority of them became fāsiqīn or murtaddīn or believes in the right or legality of cursing them has thereby disbelieved in Allah and His Messenger, denying the virtues of the Sahābah that Allah and His Messenger related.” [Ar-Radd ‘Alar-Rāfidah].
Al-Awzā’ī (died 157AH) said, “Whoever curses Abū Bakr as-Siddīq has apostatized” [Al-Ibānah as-Sughrā – Ibn Battah].
Al-Firyābī (died 212AH) was asked about one who curses Abū Bakr. He replied, “He is a kāfir” [As-Sunnah – al-Khallāl].
Ibn Hazm said, ‘The Rāfidah are not from the Muslims’ [Al-Fisal].
Imām Ahmad was asked about one who curses Abū Bakr, ‘Umar, or ‘Ā’ishah. He replied, ‘I don’t consider him to be upon Islam’ [As-Sunnah – Al-Khallāl].
He also said, ‘I fear kufr for those who – like the Rāfidah – curse the Sahābah. We can safely say that one who curses the Sahābah of the Prophet has left the religion’ [As-Sunnah – Al-Khallāl].
He also said, ‘The Rāfidah are those who declare barā’ah from the Sahābah of Muhammad, curse them, degrade them, and curse the leaders of the Sahābah except for four: ‘Alī, ‘Ammār, al-Miqdād, and Salmān. The Rāfidah have nothing to do with Islam at all’ [As-Sunnah].
Imām Al-Bukhārī said, ‘It makes no difference to me whether I were to pray behind a Jahmī or Rāfidī or behind a Jew or Christian. They are not to be greeted with salām. Their ill are not to be paid a sick visit. They are not to be married. Their funerals are not to be attended. The meat they slaughter is not to be eaten’ [Khalq Af’āl al-‘Ibād].
Ahmad Ibn Yūnus (died 227AH) said, ‘If a Jew were to slaughter a sheep and a Rāfidī were to slaughter one, I would eat from the sheep slaughtered by the Jew and not eat from the one slaughtered by the Rāfidī, because the Rāfidī is a murtadd’ [As-Sārim al-Maslūl – Ibn Taymiyyah]
So my dear readers, the quotes of our Salaf are clear on this regard, they are all disbelievers, and whoever denies their disbelief has himself landed into disbelief. And how grave this is indeed.