[2] You Desire a sound heart? Then keep Away From Ahlul Bidah [Rationalists and Philosophers Disguised as Muslim Intellectuals and advisers during times of Fitan]

Ibn Abbaas (radiyallaahu-anhumaa) said:

لا تجالس أهل الأهواء فإن مجالستهم ممرضة للقلوب

Do not sit with the people of desires (i.e. ahlul bidah) for indeed sitting with them will cause sickness to the hearts.

[Al-Ibaanah 2/438]