They used to forbid from accompanying the people of innovation

Reference: Sharh Usool I’tiqaad Ahlis-Sunnah wal-Jamaa’ah lil-Laalikaa.ee no.267

al-Fudhayl ibn ‘Iyaad رحمه الله 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.