Shaikh Hamood At-Tuwayjiree (rahimahullaah) said:
Indeed the Salaf As-Saaleh (pious predecessors) used to warn against ahlul bidah and they were severe in warning against them. They forbade (others) from listening to their speech; (forbade others) from sitting with them and (forbade others) from accompanying them.
[Al-Qawlul Baleegh Fee At-Tahdheer Min Jamaa’ah At-Tableegh. Pages: 31-33]