The Office of the Judge (Kitab Al-Aqdiyah)

Dawud :: Book 24 : Hadith 3587

Narrated AbuHurayrah:

The Prophet (peace_be_upon_him) said: Conciliation between Muslims is permissible. The narrator Ahmad added in his version: "except the conciliation which makes lawful unlawful and unlawful lawful." Sulayman ibn Dawud added: The Apostle of Allah (peace_be_upon_him) said: Muslims are on (i.e. stick to) their conditions.

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star