Mukhtasar Muslim (Abridged) 1740 — Brotherhood among the Prophet's

Jubair bin Mut’im (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: There is no alliance in Islam (i.e., such an alliance in which there is partnership even in inheritance, etc.), and any oath that was taken in the time of ignorance (for a good cause) has become even stronger with Islam.