Imaam Ahmad ibn abee al Hawaaree said Abdullaah al Basree said to him that "The sunnah with us is not that you refute ahl al ahwaa (the people of desires), but rather the sunnah with us is that you do not speak to any one from amongst them." (Meaning - it is not enough just to refute the people of innovation, but we do not speak to or sit with any of them. You may find someone who writes volumes refuting the ahl al bid'ah, but they still speak, sit, and cooperate with them!)
A Student of Knowledge said, "Imam Ahmed said, 'Laysa sunni man radd ala ahlul bidah, wa innamas sunni man yu Qallim ahlil bid'ah.' meaning "The Sunni with us is not the one who refutes Ahlul Bid'ah but the Sunnee is the one who does not speak with Ahlul Bid'ah."
No references were given. Is such a quote authentically reported from Imam Ahmed ibn Hanbal or any of the other Salaf in addition to Imam Abdullah al-Basree as mentioned above? The reference for the quote of Imam Abdullah al-Basree in my previous post is Al-Ibaanah #478