Fudhayl Ibn Iyaad rahimahullah said, 'Whoever sits with a person of innovation, then warn against him. And whoever sits with a person of innovation has not been given wisdom. And I would love that there be between me and a person of innovation an iron fortress. And he said, 'Do not trust a innovator concerning your Deen, and do not seek his advice in your affairs, and do not sit with him since whoever sits with an innovator Allaah will cause him to become blind.' He, rahimahullaah also said, Allaah has Angels who seek out the gatherings of dhikr, so look to whose gathering you sit in, let it not be with the person of innovation, since Allaah will not look at him, and the sign of hypocrisy is that a man gets up and sits with an innovator.'

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Källa: Hilyatul Awliyaa' 8/103, Sharh Usoolul I'tiqaad #264 and 265.