 Nur ad-Din did not trust Saladin and his family, correctly assuming that they were consolidating power against him; Ayyub publicly supported Nur ad-Din, but privately warned his son that Nur ad-Din should never be allowed to take Egypt from him.Najm ad-Din Ayyub was injured in a horse riding accident on July 31, 1173, and died on August 9.His death exacerbated the tension between Saladin and Nur ad-Din; the latter had summoned the former to assist in an expedition against the Kingdom of Jerusalem, but Saladin returned home when he heard of his father's death.