Musannaf Ibn Abi Shayba 27:753

Mu'adh ibn Mu'adh narrated to us, from 'Asim ibn Muhammad ibn Zayd, who said: I heard my father say: I heard Ibn 'Umar say: The Messenger of Allah (may Allah bless him and grant him peace) said: "This matter will remain in Quraysh as long as two people remain among the people." 'Asim said in his narration: And he moved his two fingers.