Musnad Abu Ya'la al-Mawsili 105:45

Al-Qawariri narrated to us, Ghundar narrated to us, Shu'bah narrated to us, from al-Hakam, who said: I heard Abu Wa'il say: When Ali sent Ammar and al-Hasan to Kufa to mobilize them, Ammar delivered a sermon and said: "As for me, I know that she is his wife in this world and the Hereafter," meaning Aisha.