"Beware of evil with each other, for indeed it is the Haliqah." [The
meaning of his saying]: "Süw'a
Dhãt Al-Bain (evil with each other)
is enmity and hatred, and his
saying: "The Haliqah"
that it severs the religion.
Jami` at-Tirmidhi Book 37, Hadith 94