ﻗﺎﻝ ﻣﺎﻟﻚ ﺑﻦ ﺩﻳﻨﺎﺭ ﺭﺣﻤﻪ ﺍﻟﻠﻪ: ﺍﻧﻈﺮ ﻳﺎ ﺃﺧﻲ ﻛﻞ ﺃﺥ ﻭ ﺻﺪﻳﻖ ﻭﺻﺎﺣﺐ ﻻ ﺗﺴﺘﻔﻴﺪ ﻣﻨﻪ ﺧﻴﺮﺍً ﻓﻲ ﺃﻣﺮ ﺩﻳﻨﻚ ﻓﻔﺮ ﻣﻨﻪ

Mālik bin Dīnār (may Allāh have mercy upon him) said:

“Look, O brother. Every brother, friend and companion you do not benefit from in your religion, flee from him!”

 Tārīkh ad-Dimashq (56/421)