Nafi' bin Jubayr (may Allah have mercy on him) narrates from his father, Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) said: "There is no (new) alliance (hilf) in Islam, and whatever alliance was made in the Jahiliyyah (pre-Islamic era), Islam has only made it stronger."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1567