Don't sit with disbelievers (read carefully to see the resmblance of the situation to the situation today i.e wahhabis,shias etc

And it has already been revealed to you in the Book (this Qur'ân) that when you hear the Verses of Allâh being denied and mocked at, then sit not with them, until they engage in a talk other than that; (but if you stayed with them) certainly in that case you would be like them. Surely, Allâh will collect the hypocrites and disbelievers all together in Hell,

An-Nisa 140