Shaikhul Islaam Ibn Taymiyyah (rahimahullaah) said: Bidah is associated with splitting just as the Sunnah is associated with the Jamaa-ah (i.e. the body of Muslims united upon the Qur’aan, the Sunnah and the understanding of the Sahaabah).  So it is said: Ahlus Sunnah Wal-Jamaa-ah (i.e. the people of Sunnah and the Jamaa-ah) just as it is said: Ahlul Furqa Wal Bidah (i.e. the people of innovation and splitting).

[Source: al-Istiqaamah 1/41]