They used to forbid from accompanying the people of innovation

Reference: al-Laalikaa’ee – Sharh Usool I’tiqaad Ahlis-Sunnah wal-Jamaa’ah (no.267)

al-Fudayl bin ‘Iyaad (rahima-hullaah) mentions:

I met the best of people, all of them people of the Sunnah and they used to forbid from accompanying the people of innovation.