Musnad Ahmad 1153:773

Aswad ibn Amir narrated to us, he said: Huraym informed us, he said: Ibn Ishaq narrated to me, from Abd al-Rahman ibn al-Qasim, from his father, from Aisha, she said: "The Prophet, peace and blessings of Allah be upon him, passed away on Monday, and he was buried on the night of Wednesday."