Musnad Ahmad 27:384

Mu'adh narrated to us, 'Asim ibn Muhammad narrated to us, I heard my father say: I heard 'Abdullah ibn 'Umar say: The Messenger of Allah (peace and blessings of Allah be upon him) said: "This matter will remain in Quraysh as long as two people remain among the people." He said: And he moved his two fingers, twisting them like this.