"When you see those who indulge in vain speech regarding our verses, turn away from them until they indulge in other speech. If the Shaytaan causes you to forget, then do not sit after remembering with the wrong doing people." (Soorah Al-An'aam: 68)
Ash-Shaykh Al-Allaamah Abdur Rahmaan As-Sa'dee (may Allaah have mercy upon him) stated in his Tafseer of this verse:
"That which is intended by indulging in vain speech regarding the verses of Allaah, is speaking with that which opposes the truth from beautifying the false statements, calling to them, and praising its people. It also entails turning away from the truth, speaking ill of it and its people. Therefore, Allaah has commanded His Messenger firstly and His nation after that, that when they see one who indulges in vain speech regarding the verses of Allaah with anything that has been mentioned (previously), to turn away from them, do not attend the gatherings of those who indulge in falsehood and remain upon doing so...This statement includes those who indulge in vain speech with falsehood, everyone who speaks with that which is prohibited or the one who does that which is prohibited. Indeed it is prohibited to sit and be present in the presence of evil that one does not have the ability to change."
Sisters Upon Al-Istiqaamah