It was narrated that al-Bara (may Allaah be pleased with him) said: I heard the Prophet (peace and blessings of Allaah be upon him) say: The Ansaar: no one loves them but a believer and no one hates them but a hypocrite. Whoever loves them, Allaah will love him, and whoever hates them, Allaah will hate him.
Shaykh Saalih al-Fawzaan said:
The way of Ahl al-Sunnah wal-Jamaaah is to love the family (ahl al-bayt) of the Prophet (peace and blessings of Allaah be upon him).
The Naasibis love the Sahaabah but hate the family of the Prophet (peace and blessings of Allaah be upon him), hence they were called Naasibis because they set themselves up (nasb) as enemies of the family of the Prophet (peace and blessings of Allaah be upon him).
The Raafidis are the opposite: they love the Prophets family (ahl al-bayt) or so they claim, but they hate the Sahaabah, whom they curse, denounce as kaafirs and criticize.
Whoever hates the Sahaabah hates Islam, because they are the bearers of Islam and the followers of the Chosen Prophet (peace and blessings of Allaah be upon him). So whoever hates them hates Islam, and this indicates that there is no faith in the hearts of such people and that they do not love Islam.
This is an important basic principle which the Muslims should understand, namely loving and respecting the Sahaabah, because that is part of faith. Hating them or hating one of them is kufr and hypocrisy, because loving them is part of loving the Prophet (peace and blessings of Allaah be upon him) and hating them is part of hating the Prophet (peace and blessings of Allaah be upon him).